Revert "GitHub Action disable codesign on macOS"

This reverts commit 963b798.

Author: pkongkha

.github/workflows/main.yml

@@ -74,7 +74,7 @@ jobs:
       - uses: subosito/flutter-action@v2
         with:
           flutter-version: ${{ env.FLUTTER_VERSION }}
-      - run: flutter build macos --release --no-codesign
+      - run: flutter build macos --release
       - uses: actions/upload-artifact@v4
         with:
           name: macos-app