Bump file_selector_macos in /experimental/linting_tool (#1333)

Bumps [file_selector_macos](https://github.com/flutter/plugins/tree/main/packages/file_selector) from 0.8.2+2 to 0.9.0.
- [Release notes](https://github.com/flutter/plugins/releases)
- [Commits](https://github.com/flutter/plugins/commits/file_selector_macos-v0.9.0/packages/file_selector)

---
updated-dependencies:
- dependency-name: file_selector_macos
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

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

experimental/linting_tool/pubspec.yaml

@@ -16,7 +16,7 @@ dependencies:
   equatable: ^2.0.3
   file_selector: ^0.8.2
   file_selector_linux: ^0.0.2+1
-  file_selector_macos: ^0.8.2
+  file_selector_macos: ^0.9.0
   file_selector_web: ^0.8.1+1
   file_selector_windows: ^0.8.2
   flutter_markdown: ^0.6.2