chore(deps): bump file_picker in /packages/stream_chat_flutter

Bumps [file_picker](https://github.com/miguelpruivo/flutter_file_picker) from 5.5.0 to 6.1.1.
- [Release notes](https://github.com/miguelpruivo/flutter_file_picker/releases)
- [Changelog](https://github.com/miguelpruivo/flutter_file_picker/blob/master/CHANGELOG.md)
- [Commits](https://github.com/miguelpruivo/flutter_file_picker/commits)

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

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

packages/stream_chat_flutter/pubspec.yaml

@@ -19,7 +19,7 @@ dependencies:
   diacritic: ^0.1.4
   dio: ^5.3.2
   ezanimation: ^0.6.0
-  file_picker: ^5.3.3
+  file_picker: ">=5.3.3 <7.0.0"
   file_selector: ^1.0.0
   flutter:
     sdk: flutter