Install Python 3.12 on CI

Author: lysnikolaou

.github/workflows/precommit.yaml

@@ -14,12 +14,12 @@ jobs:
     steps:
       - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
         with:
-          submodules: "true"
+          submodules: true
           fetch-depth: 2
       - name: Setup python
         uses: actions/setup-python@39cd14951b08e74b54015e9e001cdefcf80e669f # v5.1.1
         with:
-          python-version: "3.x"
+          python-version: 3.12
       - name: Install system deps
         run: |
           sudo apt-get update