Bump leancode_lint from 6.0.0 to 12.1.0 in the all_dependencies group

Bumps the all_dependencies group with 1 update: [leancode_lint](https://github.com/leancodepl/flutter_corelibrary).


Updates `leancode_lint` from 6.0.0 to 12.1.0
- [Release notes](https://github.com/leancodepl/flutter_corelibrary/releases)
- [Commits](leancodepl/flutter_corelibrary@leancode_lint-v6.0.0...leancode_lint-v12.1.0)

---
updated-dependencies:
- dependency-name: leancode_lint
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: all_dependencies
...

Signed-off-by: dependabot[bot] <[email protected]>

pubspec.yaml

@@ -19,6 +19,6 @@ dev_dependencies:
   bloc_test: ^9.1.4
   flutter_test:
     sdk: flutter
-  leancode_lint: ^6.0.0
+  leancode_lint: ">=6.0.0 <13.0.0"
 
 flutter: