Update action.yml

Author: JarvanMo

.github/actions/publish_flutter_package/action.yml

@@ -37,5 +37,6 @@ runs:
 
     - name: 📢 Publish
       shell: ${{ inputs.shell }}
+      run: flutter config --enable-swift-package-manager          
       run: flutter pub publish -f
       working-directory: ${{ inputs.working-directory }}