cleanup + attempt to fix frontend action

Author: jakob-qd

.github/workflows/check.yaml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Setup Rust
         uses: actions-rs/toolchain@v1
         with:
@@ -29,14 +29,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Setup Flutter
         uses: subosito/flutter-action@v2
         with:
           channel: stable
-          flutter-version-file: flutter_frontend/pubspec.yaml
-      - name: Run Flutter Version
-        run: flutter --version
+          flutter-version: 3.22.2
       - name: Get Dependencies
         working-directory: flutter_frontend
         run: flutter pub get