fixed error in github action

Signed-off-by: Christoph Massmann <[email protected]>

.github/workflows/verify-plugin-scripts.yml

@@ -11,7 +11,7 @@ jobs:
     - name: Set up Python 3.10
       uses: actions/setup-python@v4
       with:
-        python-version: 3.10
+        python-version: '3.10'
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip