SP-1085 Run format check on the earliest supported Python version

Author: bobbrodie

.github/workflows/build.yml

@@ -9,7 +9,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
-          python-version: 3.13
+          python-version: 3.9
       - name: Install pipenv
         run: |
           pip3 install pipenv