Bump package_config from 2.2.0 to 3.0.0

[dependabot]

Bumps package_config from 2.2.0 to 3.0.0.

Release notes

Sourced from package_config's releases.

package:package_config v3.0.0

• Adds discovery API to find both a configuration and its location: findPackageConfigAndFile and findPackageConfigAndUri.
• Removes support for the .packages file. The Dart SDK no longer supports that file, and no new .packages files will be generated. Since the SDK requirement for this package is above 3.0.0, no supporting SDK can use or generate .packages.
• Simplifies API that no longer needs to support two separate files.
  • Renamed readAnyConfigFile to readConfigFile, and removed the preferNewest parameter.
  • Same for readAnyConfigFileUri which becomes readConfigFileUri.
  • Old functions still exists as deprecated, forwarding to the new functions without the preferNewest argument. Makes PackageConfig, Package and LanguageVersion @sealed classes, in preparation for making them final in a future update.
• Adds PackageConfig.minVersion to complement .maxVersion. Currently both are 2.

Commits

• 7882add publish package_config (#2421)
• 338a2c8 [api_summary] Include mixins in textual API summaries (#2417)
• c436f99 feat(api_summary): Move api_summary package into the tools monorepo (#2412)
• abd6780 [markdown] fix new lint RE await in an async function (#2416)
• fc11c6e [code_builder] Expand code coverage (#2409)
• 999a2df [code_builder] Emit ignore_for_file bits correctly (#2406)
• 215ed97 [code_builder] Drop unused dev_deps and rebuild (#2407)
• 6b99b07 Remove some extra spaces in unformatted output (#2403)
• 2bf09de Mark AnsiCode and AnsiCodeType final (#2402)
• 03f2c20 publish cli_util version 0.5.1 (#2397)
• Additional commits viewable in compare view

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