Bump lints from 5.1.1 to 6.0.0 (#2581)

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]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pubspec.yaml

@@ -44,7 +44,7 @@ dev_dependencies:
   dartdoc: ^8.0.14
   grinder: ^0.9.0
   node_preamble: ^2.0.2
-  lints: ">=4.0.0 <6.0.0"
+  lints: ">=4.0.0 <7.0.0"
   protoc_plugin: "^22.0.1"
   pub_api_client: ">=2.1.1 <4.0.0"
   pubspec_parse: ^1.3.0