added PyQt5

.github/workflows/test_qgis_color_func.yml

@@ -24,7 +24,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install pytest pytest-qt
+        pip install pytest pytest-qt PyQt5
 
     - name: Run tests
       run: pytest test_qgis_color.py