build(deps): bump lints from 3.0.0 to 4.0.0 in /dio (#2053)

* build(deps): bump lints from 3.0.0 to 4.0.0 in /dio

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] <support@github.com>

* Update

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: GIancarlo Buenaflor <giancarlo_buenaflor@yahoo.com>

dio/pubspec.yaml

@@ -23,7 +23,7 @@ dependencies:
 
 dev_dependencies:
   meta: ^1.3.0
-  lints: ^3.0.0
+  lints: ^4.0.0
   test: ^1.21.1
   coverage: ^1.3.0
   mockito: ^5.1.0

dio/test/version_test.dart

@@ -1,4 +1,5 @@
 @TestOn('vm')
+library dio_test;
 
 import 'dart:io';