fix: add setup-python for pre-commit on arc runner

Author: xnoto

.github/workflows/_ci.yml

@@ -16,6 +16,11 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
       - name: Install actionlint
         run: |
           mkdir -p "$HOME/.local/bin"