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] <[email protected]>

Author: dependabot[bot]

pubspec.yaml

@@ -25,7 +25,7 @@ dependencies:
 dev_dependencies:
   async: ^2.11.0
   dart_style: ^3.0.0
-  lints: ^5.0.0
+  lints: ">=5.0.0 <7.0.0"
   matcher: ^0.12.15
   sass: ^1.87.0
   test: ^1.24.2