Bump lints from 5.1.1 to 6.0.0

Bumps [lints](https://github.com/dart-lang/core/tree/main/pkgs) from 5.1.1 to 6.0.0.
- [Release notes](https://github.com/dart-lang/core/releases)
- [Commits](https://github.com/dart-lang/core/commits/lints-v6.0.0/pkgs)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pubspec.yaml

@@ -20,7 +20,7 @@ dependencies:
   http: ^1.4.0
   io: ^1.0.5
   json_annotation: ^4.9.0
-  lints: ^5.1.1
+  lints: ^6.0.0
   logging: ^1.3.0
   markdown: ^7.3.0
   meta: ^1.17.0