fix gendoc ci

.github/workflows/gendoc.yml

@@ -23,7 +23,10 @@ jobs:
 
       - name : Install dependencies
         run: sudo apt-get install -y git cmake build-essential doxygen graphviz python3-dev mkdocs mkdocs-material
-
+
+      - name: Install python dependencies
+        run: python -m pip install mkdocs mkdocs-material
+
       - name: Generate documentation
         run: cd docs && make all