Update actions

Author: SiekamCebule

.github/workflows/ci.yml

@@ -8,7 +8,10 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
+    
+    - name: Test connection
+      run: curl "https://storage.googleapis.com/flutter_infra_release/releases/releases_linux.json"
 
     - name: Set up Flutter
       uses: subosito/flutter-action@v2