Consistently install branch specific dependencies in CI (#25874)

.github/workflows/docs.yml

@@ -35,9 +35,10 @@ jobs:
         fetch-depth: 1
 
     - name: Install dependencies
+      run: pip3 install -r requirements-dev.txt
+
+    - name: Install nvm
       run: |
-        apt-get update && apt-get install -y rsync doxygen
-        # install nvm
         touch $HOME/.bashrc
         wget -qO- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.7/install.sh | bash