[geocoding_ios]: Bump flutter_lints in /geocoding_ios

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] <[email protected]>

Author: dependabot[bot]

geocoding_ios/pubspec.yaml

@@ -18,7 +18,7 @@ dev_dependencies:
   flutter_test:
     sdk: flutter
 
-  flutter_lints: ^5.0.0
+  flutter_lints: ">=5.0.0 <7.0.0"
   mockito: ^5.0.0
   plugin_platform_interface: ^2.0.0