Use newer Python in docs build (python#17747)

Helps with python#17742

Author: hauntsaninja

.github/workflows/docs.yml

@@ -36,7 +36,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
-          python-version: '3.8'
+          python-version: '3.12'
       - name: Install tox
         run: pip install tox==4.11.0
       - name: Setup tox environment