Update mkdocs.yml

Author: bsergean

.github/workflows/mkdocs.yml

@@ -11,10 +11,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
-    - name: Set up Python 3.8
+    - name: Set up Python 3.11
       uses: actions/setup-python@v1
       with:
-        python-version: 3.8
+        python-version: 3.11
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip