Fix CI: CodeQL Setup

Fix broken Python setup in CodeQL CI.

.github/workflows/codeql.yml

@@ -30,15 +30,21 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
+      - uses: actions/setup-python@v5
+        name: Install Python
+        with:
+          python-version: '3.x'
+
       - name: Install Packages
         run: |
           sudo apt-get update
           sudo apt-get install --yes cmake openmpi-bin libfftw3-dev libfftw3-mpi-dev libopenmpi-dev libhdf5-openmpi-dev
 
           python -m pip install --upgrade pip
+          python -m pip install --upgrade pipx
           python -m pip install --upgrade wheel
           python -m pip install --upgrade cmake
-          export CMAKE="$HOME/.local/bin/cmake" && echo "CMAKE=$CMAKE" >> $GITHUB_ENV
+          python -m pipx install --upgrade cmake
           python -m pip install --upgrade numpy
           python -m pip install --upgrade mpi4py
           python -m pip install --upgrade pytest