Update jupyter-notebooks.yml

Author: rbanerjee20

.github/workflows/jupyter-notebooks.yml

@@ -68,7 +68,7 @@ jobs:
         python -m pip install --upgrade pip
         pip install -e .
         pip install matplotlib
-        pip install pytest==4.0.2
+        pip install pytest==6.0.0
         pip install --user git+https://github.com/devitocodes/devito.git
     - name: Waves notebooks (2.1 and 2.2)
       run: |