Chore(deps): Bump flutter_lints from 4.0.0 to 6.0.0 (#202)

Bumps [flutter_lints](https://github.com/flutter/packages/tree/main/packages) from 4.0.0 to 6.0.0.
- [Release notes](https://github.com/flutter/packages/releases)
- [Commits](https://github.com/flutter/packages/commits/flutter_lints-v6.0.0/packages)

---
updated-dependencies:
- dependency-name: flutter_lints
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pubspec.yaml

@@ -35,7 +35,7 @@ dev_dependencies:
   ffigen: ^11.0.0
   test: ^1.16.0
   yaml: ^3.0.0
-  flutter_lints: ^4.0.0
+  flutter_lints: ^6.0.0
   flutter_test:
     sdk: flutter
   coverage: any # we only need format_coverage, don't care what version