Fix CodeQL warnings.

Author: ZCG-coder

.github/workflows/codeql.yml

@@ -60,7 +60,7 @@ jobs:
               uses: actions/setup-python@v5
               with:
                 cache: 'pip'
-                python-version: ${{ matrix.python_version }}
+                python-version: '3.12'
 
             - name: Install dependencies
               run: pip install .