Update code-formatting.yml

Author: matthias-bs

.github/workflows/code-formatting.yml

@@ -7,8 +7,10 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: actions/setup-python@v4
+      with:
+        python-version: '3.11'
     - name: Install packages
       run: source tools/ci.sh && ci_code_formatting_setup
     - name: Run code formatting