chore(deps): bump lints from 3.0.0 to 4.0.0 in /dart (#4)

Bumps [lints](https://github.com/dart-lang/lints) from 3.0.0 to 4.0.0.
- [Release notes](https://github.com/dart-lang/lints/releases)
- [Changelog](https://github.com/dart-lang/lints/blob/main/CHANGELOG.md)
- [Commits](dart-lang/lints@v3.0.0...v4.0.0)

---
updated-dependencies:
- dependency-name: lints
  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>

dart/pubspec.yaml

@@ -14,5 +14,5 @@ dependencies:
   protobuf: ^3.1.0
 
 dev_dependencies:
-  lints: ^3.0.0
+  lints: ">=3.0.0 <5.0.0"
   test: ^1.24.0