Pin ruff version

ruff action is broken with ruff 0.5.0, pin older version

see #92

.github/workflows/pyleco_CI.yml

@@ -29,6 +29,7 @@ jobs:
       - name: Lint with ruff
         uses: chartboost/ruff-action@v1
         with:
+          version: 0.4.10  # ruff-action@v1 is broken in regard to ruff 0.5.0
           args: --extend-select=E9,F63,F7,F82 --show-source
       - uses: ammaraskar/sphinx-problem-matcher@master
       - name: Generate docs