Fix python version to avoid break in 3.12.1

Author: nseidle

.github/workflows/mkdocs.yml

@@ -10,6 +10,6 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
         with:
-          python-version: 3.x
+          python-version: 3.12.0
       - run: pip install mkdocs-material mkdocs-monorepo-plugin
       - run: mkdocs gh-deploy --force