Bump build_runner from 2.11.1 to 2.12.1 in the dev-dependencies group

[dependabot]

Bumps the dev-dependencies group with 1 update: build_runner.

Updates build_runner from 2.11.1 to 2.12.1

Release notes

Sourced from build_runner's releases.

package:build_runner v2.12.1

• Require build_config 1.3.0.

package:build_runner v2.12.0

• Add support for globs in the package list of workspace pubspec.yaml, matching the new feature in Dart SDK 3.11.
• Support the build_to key added to post_process_builders in build_config 1.3.0. Post process builders can use this to output files to the source tree.
• Bug fix: prevent logging crash when using build_test in a builder.

Commits

• 402553f Require build_config 1.3.0. (#4382)
• fefca8b Support globs in workspace pubspecs. (#4379)
• dbfd35c Fixing sourcemaps for DDC Library Bundle builds (#4376)
• acea1f9 Bump actions/stale from 10.1.1 to 10.2.0 in the github-actions group (#4377)
• f712151 build_web_compilers: Support web workers in entrypoint loader (#4375)
• b3cad44 Updating sourcemap logic in DDC library bundle sources (#4374)
• 03074ee Allow post process builders to output non-hidden source. (#4373)
• 6b3c8a4 Fix test setup to use workspace. (#4372)
• f7abd26 Fix resolving with build_test within a builder. (#4370)
• 19707f8 Cleaning up setStartAsyncSynchronously (#4369)
• Additional commits viewable in compare view

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