Removed forced upgrade of jupyter-book

Now that would get us Jupyter Book 2.

Author: matthew-brett

.github/workflows/pages.yml

@@ -28,8 +28,6 @@ jobs:
         run: |
           python -m pip install --upgrade pip wheel setuptools
           python -m pip install -r build_requirements.txt
-          # Resolution pushes jupyter-book down many versions.  Force upgrade.
-          python -m pip install -U jupyter-book
 
       - name: "Build HTML"
         run: |