Bump lints from 4.0.0 to 5.0.0 in /web/_tool

Bumps [lints](https://github.com/dart-lang/lints) from 4.0.0 to 5.0.0.
- [Release notes](https://github.com/dart-lang/lints/releases)
- [Changelog](https://github.com/dart-lang/lints/blob/main/CHANGELOG.md)
- [Commits](https://github.com/dart-lang/lints/compare/v4.0.0...v5.0.0)

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

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

web/_tool/pubspec.yaml

@@ -9,4 +9,4 @@ dependencies:
   path: ^1.8.0
 
 dev_dependencies:
-  lints: ^4.0.0
+  lints: ^5.0.0