CI: Bump Python to 3.11 to avoid contextlib.chdir error

> ImportError: cannot import name 'chdir' from 'contextlib' (/opt/hostedtoolcache/Python/3.10.15/x64/lib/python3.10/contextlib.py)

Author: kernc

.github/workflows/ci.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.10', '>=3']
+        python-version: ['3.11', '>=3']
     steps:
       - uses: actions/checkout@v4
       - uses: ./.github/actions/setup