DOCS: pin mkdocs version

Signed-off-by: jokob-sk <jokob.sk@gmail.com>

.github/workflows/mkdocs.yml

@@ -18,14 +18,14 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          python-version: '3.9'
+          python-version: '3.11'
 
       - name: Install MkDocs
         run: |
           pip install \
             mkdocs==1.6.0 \
             mkdocs-material==9.5.21 \
-            mkdocs-github-admonitions-plugin==0.0.4
+            mkdocs-github-admonitions-plugin==0.1.1
 
       - name: Build MkDocs
         run: mkdocs build