Update Python version in GitHub Actions workflow for style

Author: psakievich

.github/workflows/tests.yml

@@ -53,7 +53,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.9]
+        python-version: [3.11]
     steps:
     - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}