Update make_docs.yaml

added missing mkdocstring dependency

Author: haeussma

.github/workflows/make_docs.yaml

@@ -21,6 +21,5 @@ jobs:
         with:
           path: .cache
           key: ${{ github.ref }}
-      - run: pip install mkdocs-material
-      - run: pip install mkdocs-jupyter
+      - run: pip install mkdocs-material mkdocstrings mkdocs-jupyter
       - run: mkdocs gh-deploy --force