CI: Install required extras to document cvxpy annotations

.github/workflows/main.yml

@@ -36,7 +36,7 @@ jobs:
         sudo apt-get update -y
         sudo apt-get install pandoc
         sudo apt-get update -y
-        pip install -e .[docs]
+        pip install -e .[docs,cvxpy,sbr]
     - name: Build docs
       run: |
         cd docs