Update build_test.yml

Author: JarvanMo

.github/workflows/build_test.yml

@@ -53,6 +53,5 @@ jobs:
       - uses: subosito/flutter-action@v2
         with:
           channel: stable
-      - run: flutter config --enable-swift-package-manager
-      - run: flutter pub get
+      - run: flutter config --enable-swift-package-manager; flutter pub get
       - run: cd example; flutter build apk --debug