Update dependency source_gen to v4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
source_gen (source)	dependencies	major	^0.9.5 → 4.2.0

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Release Notes

dart-lang/source_gen (source_gen)

v4.2.0

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• Add header configuration to CombiningBuilder.

v4.1.2

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• Allow analyzer: '>=8.1.1 <11.0.0'.

v4.1.1

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• Allow analyzer: '>=8.1.1 <10.0.0'.

v4.1.0

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• Add TypeChecker.typeNamedLiterally. It's like TypeChecker.typeNamed,
  but takes a String instead of a Type.

v4.0.2

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• Bug fix: fix possible null pointer exception in TypeChecker.typeNamed on
  invalid code.

v4.0.1

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• Require analyzer: '>=8.1.1 <9.0.0'.
• Allow build: '>=3.0.0 <5.0.0'.

v4.0.0

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• Breaking Change: remove TypeChecker.fromRuntime, use
  TypeChecker.typeNamed instead. This removes all use of dart:mirror, so
  builders using source_gen can be AOT compiled for better performance.
• Keep // GENERATED FILE comments on the first line.

v3.1.0

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• Prepare to stop using dart:mirrors: deprecate TypeChecker.fromRuntime.
  It will be removed in version 4.0.0. Add TypeChecker.typeNamed which is
  the recommended replacement.
• Prepare to stop using dart:mirrors: add inPackage and inSdk parameters
  to GenerateForAnnotation. These will start being used in version 4.0.0
  when it switches to TypeChecker.typeNamed.
• InvalidGenerationSource support for Fragment, ElementDirective and
  Annotatable.
• Allow analyzer: '>=7.4.0 <9.0.0'.

v3.0.0

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• Breaking Change: use the new element2 APIs in analyzer. Builders that
  do resolution need to switch to the new API, see
  https://github.com/dart-lang/sdk/blob/main/pkg/analyzer/doc/element_model_migration_guide.md.
  For questions please use https://github.com/dart-lang/build/discussions.
• Breaking Change: annotations are now reported separately for elements
  and directives. If you use TypeChecker().annotatedWith(), see also
  the new TypeChecker().libraryDirectivesAnnotatedWith(). If you use
  GeneratorForAnnotation see the new generateForAnnotatedDirective.
• Require build: ^3.0.0
• Updated the minimum package versions for a number of dependencies.
• Require Dart 3.7.0
• Update the GeneratorForAnnotation optimization to skip files with well known
  annotation names such as override, Deprecated, and pragma.

v2.0.0

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• Breaking Change: Change formatOutput function to accept a language
  version parameter.
• Formatting Change: Generated code will no longer apply any fixes by
  default (previously it would apply the single cascades statements fix). The
  new formatter does not support applying fixes.
• Document deduplication behavior for the output of
  GeneratorForAnnotation.generateForAnnotatedElement.
• Support all the glob quotes.
• Require analyzer: '>=6.9.0 <8.0.0'
• Support the latest package:dart_style
• LibraryBuilder, PartBuilder, and SharedPartBuilder now take an optional
  writeDescriptions boolean. When set to false, headers and generator
  descriptions for the files will not be included in the builder output.
• Include //dart format width=80 comments in files generated by a
  LibraryBuilder or PartBuilder and formatted with the default callback.
• Require Dart 3.6.0

v1.5.0

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• Add throwOnUnresolved configuration to the GeneratorForAnnotation
  constructor.
• Rename InvalidGenerationSourceError to InvalidGenerationSource. Change
  from a subtype of Error to a subtype of Exception. This may be breaking if
  a builder relies on a on Exception catch to ignore this error.

v1.4.0

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• Require Dart 3.0
• Support the latest package:analyzer.
• Add a node argument to InvalidGenerationSourceError to allow finding the
  source location from an AstNode over an Element.

v1.3.2

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• Make TypeChecker.isAssignableFromType() null safe.

v1.3.1

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• Always use a Uri in part of directives (previously a name would be used if
  the library had a non-empty one).

v1.3.0

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• Add support for build_extensions configuration of builders producing
  multiple files. For example:
  build_extensions: { '.dart': ['.stub.dart', '.web.dart', '.vm.dart'] }
• Avoid throwing when a type without a backing class is checked with
  TypeChecker.
• Include imports, exports, and part directives in LibraryReader.allElements.
  This allows GeneratorForAnnotation to target annotated directives.

v1.2.7

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• Update the value of the pubspec repository field.
• Require Dart SDK version 2.18.
• Fix type-checking mixin elements with TypeChecker.

v1.2.6

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• Add support for a preamble option to combining_builder.

v1.2.5

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• Fix another issue with overly specific types.

v1.2.4

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• Fix overly-specific cast.

v1.2.3

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• Require analyzer: '>=4.6.0 <6.0.0'
• Require sdk: '>=2.17.0 <3.0.0'

v1.2.2

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• Enable the fix for single cascade statements when formatting Dart code.
  • Individual builders can opt out of this by providing a custom formatOutput
    function to the PartBuilder or LibraryBuilder constructors.
• Allow analyzer version 4.x.

v1.2.1

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• Allow reviving constants which are static fields defined on the class which
  represents their type. Previously we checked this pattern only for enums,
  however there are enum-like usages in classes which are not enums.
• Allow the latest version of package:analyzer.

v1.2.0

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• Include the LibraryElement in LibraryReader.allElements,
  LibraryReader.annotatedWith, and LibraryReader.annotatedWithExact. Run
  GeneratorForAnnotation generators on library elements when the library
  statement has the annotation.
• Add support for build_extensions configuration to the PartBuilder and
  LibraryBuilder. You must forward the BuilderOptions object to the super
  constructor for this to work.
• Fix a bug finding source locations for reporting unresolved annotations on
  parameters.
• Fix a bug checking for part statements on Windows.

v1.1.1

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• Drop dependency on package:pedantic.

v1.1.0

• Add the build_extensions option to combining_builder, allowing output
  files to be generated into a different directory.

v1.0.5

• Fix a bug with reviving constant expressions which are fields defined on a
  different class than their type (but in the same library).

v1.0.4

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• Fix warnings with latest analyzer, require analyzer 2.x.

v1.0.3

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• Allow the latest version of package:analyzer.

v1.0.2

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• Fix TypeChecker.fromRuntimeType for types that come from non-package uris.

v1.0.1

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• Improve the error message for a missing part directive.
• Upgrade to package:analyzer version 1.7.0.

v1.0.0

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• Migrate to null safety.
• Drop deprecated APIs:
  • ConstantReader.isAny.
  • ConstantReader.anyValue.
  • LibraryReader.classElements.

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