update git workflow

Author: stes

.github/workflows/docs.yml

@@ -74,7 +74,7 @@ jobs:
           rm pandoc-3.1.9-1-amd64.deb
           pip install torch --extra-index-url https://download.pytorch.org/whl/cpu
           pip install '.[docs]'
-
+          pip install -r docs/requirements.txt
 
       - name: Build docs
         run: |