Force pipenv version

Author: medengineer

.github/workflows/sphinx-build.yml

@@ -23,7 +23,7 @@ jobs:
 
       - name: Install pipenv
         run: |
-          python -m pip install --upgrade pipenv wheel
+          python -m pip install --upgrade pipenv==2024.4.1 wheel
 
       - name: Install dependencies
         run: |