[geolocator_linux]: Bump flutter_lints in /geolocator_linux

Bumps [flutter_lints](https://github.com/flutter/packages/tree/main/packages) from 5.0.0 to 6.0.0.
- [Release notes](https://github.com/flutter/packages/releases)
- [Commits](https://github.com/flutter/packages/commits/flutter_lints-v6.0.0/packages)

---
updated-dependencies:
- dependency-name: flutter_lints
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

geolocator_linux/pubspec.yaml

@@ -27,7 +27,7 @@ dependencies:
 
 dev_dependencies:
   build_runner: ^2.1.8
-  flutter_lints: ^5.0.0
+  flutter_lints: ">=5.0.0 <7.0.0"
   flutter_test:
     sdk: flutter
   mockito: ^5.0.17