CI: Fix pre-commit action

Since Ubuntu 24.04 it requires python to be installed via actions/setup-python

Author: rhaschke

.github/workflows/format.yml

@@ -19,4 +19,7 @@ jobs:
     - uses: actions/checkout@v4
     - name: Install clang-format-10
       run: sudo apt-get install clang-format-10
+    - uses: actions/setup-python@v5
+      with:
+        python-version: 3.x
     - uses: pre-commit/[email protected]