Update notebook-pr.yaml

.github/workflows/notebook-pr.yaml

@@ -64,7 +64,7 @@ jobs:
       - name: Install dependencies
         if: "!contains(env.COMMIT_MESSAGE, 'skip ci')"
         run: |
-          apt-get update && apt-get install ffmpeg libsm6 libxext6  -y
+          apt-get update && apt-get install ffmpeg libsm6 libxext6 libgl1 -y
           python -m pip install --upgrade pip wheel
           pip install -r requirements.txt
           pip install jupyter_client==7.3.5  # downgrade jupyter-client to fix hangs