Test docs build with more modern Python version

Author: AlexanderWells-diamond

.github/workflows/docs.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v2
         with:
-          python-version: "3.7"
+          python-version: "3.10"
 
       - name: Install Python Dependencies
         run: |