chore: update Flutter bindings

Author: github-actions[bot]

crates/yttrium_dart/pubspec.yaml

@@ -10,7 +10,7 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
-  flutter_rust_bridge: ^2.7.0
+  flutter_rust_bridge: 2.7.0
   flutter_web_plugins:
     sdk: flutter
   freezed_annotation: ^2.4.4