chore: add flutter plugins to .gitignore

- Add .flutter-plugins and .flutter-plugins-dependencies to .gitignore file
- These files are specific to Flutter development and should not be tracked by Git

Author: fulleni

.gitignore

@@ -12,6 +12,8 @@
 .swiftpm/
 migrate_working_dir/
 .gemini/
+.flutter-plugins
+.flutter-plugins-dependencies
 
 # IntelliJ related
 *.iml