Update deploy.yml

.github/workflows/deploy.yml

@@ -19,7 +19,7 @@ jobs:
 
       - name: Install MkDocs and dependencies
         run: |
-          pip install mkdocs mkdocs-material
+          pip install mkdocs mkdocs-material mkdocstrings
 
       - name: Build the MkDocs site
         run: mkdocs build