Modified the flutter version on the ci/cd workflow

Author: Yczar

.github/workflows/main.yml

@@ -14,7 +14,7 @@ jobs:
           java-version: '12.x'
       - uses: subosito/flutter-action@v1
         with:
-          flutter-version: '1.22.2'
+          flutter-version: '2.0.5'
       - run: flutter pub get
       - run: flutter build apk -t lib/main.dart --split-per-abi
       - name: Release apk