Update dependency dart_style to v2 - abandoned

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This PR contains the following updates:

Package	Type	Update	Change
dart_style	dependencies	major	^1.3.3 -> ^2.0.0

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Release Notes

dart-lang/dart_style

v2.3.0

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New language features

• Format patterns and related features.
• Format record expressions and record type annotations.
• Format class modifiers base, final, interface, mixin, and sealed.
• Format inline class declarations.
• Format unnamed libraries.

Bug fixes and style changes

• Handle sync* and async* functions with => bodies.
• Fix bug where parameter metadata wouldn't always split when it should.
• Don't split after < in collection literals.
• Better indentation of multiline function types inside type argument lists.

Internal changes

• Use typed _visitFunctionOrMethodDeclaration instead of dynamically typed.
• Fix metadata test to not fail when record syntax makes whitespace between
  metadata annotation names and ( significant (sdk#​50769).
• Require Dart 2.19.
• Require package:analyzer ^5.7.0.

v2.2.5

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• Format unnamed libraries.
• Require Dart 2.17.

v2.2.4

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• Unify how brace-delimited syntax is formatted. This is mostly an internal
  refactoring, but slightly changes how a type body containing only an inline
  block comment is formatted.
• Refactor Chunk to store split before text instead of after. This mostly does
  not affect the visible behavior of the formatter, but a few edge cases are
  handled slightly differently. These are all bug fixes where the previous
  behavior was unintentional. The changes are:
• Consistently discard blank lines between a { or [ and a subsequent
  comment. It used to do this before the { in type bodies, but not switch
  bodies, optional parameter sections, or named parameter sections.
• Don't allow splitting an empty class body.
• Allow splitting after an inline block comment in some places where it makes
  sense.
• Don't allow a line comment in an argument list to cause preceding arguments
  to be misformatted.
• Remove blank lines after a line comment at the end of a body.
• Require package:analyzer >=4.4.0 <6.0.0.

v2.2.3

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• Allow the latest version of package:analyzer.

v2.2.2

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• Format named arguments anywhere (#​1072).
• Format enhanced enums (#​1075).
• Format "super." parameters (#​1091).

v2.2.1

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• Require package:analyzer version 2.6.0.
• Use NamedType instead of TypeName.

v2.2.0

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• Fix analyzer dependency constraint (#​1051).

v2.1.1

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• Republish 2.0.3 as 2.1.1 in order to avoid users getting 2.1.0, which has a
  bad dependency constraint (#​1051).

v2.1.0

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• Support generic function references and constructor tear-offs (#​1028).

v2.0.3

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• Fix hang when reading from stdin (https://github.com/dart-lang/sdk/issues/46600).

v2.0.2

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• Don't unnecessarily split argument lists with /* */ comments (#​837).
• Return correct exit code from FormatCommand when formatting stdin (#​1035).
• Always split cascades with multiple sections (#​1006).
• Don't indent cascades farther than their receiver method chains.
• Optimize line splitting cascades (#​811).
• Split empty catch blocks with finally clauses (#​1029).
• Split empty catch blocks with catches after them.
• Allow the latest version of package:analyzer.

v2.0.1

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• Support triple-shift >>> and >>>= operators (#​992).
• Support non-function type aliases (#​993).
• Correct constructor initializer indentation after required (#​1010).

v2.0.0

• Migrate to null safety.

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