chore: update flutter version to 3.35.x in gh action workflows

Author: am-casper

.github/workflows/cd.yml

@@ -39,7 +39,7 @@ jobs:
       - uses: subosito/flutter-action@v2
         with:
           channel: "stable"
-          flutter-version: 3.25.x
+          flutter-version: 3.35.x
 
       # Get flutter dependencies.
       - run: flutter pub get

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
       - uses: subosito/flutter-action@v2
         with:
           channel: "stable"
-          flutter-version: 3.25.x
+          flutter-version: 3.35.x
 
       # Get flutter dependencies.
       - run: flutter pub get