Update docs.yml

Author: sol1105

.github/workflows/docs.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install mkdocs mkdocs-material mkdocstrings
+          pip install mkdocs mkdocs-material mkdocstrings[python]
 
       - name: Build MkDocs site
         run: mkdocs build --clean