chore: install python dev dependencies in CI

Author: bryanchriswhite

.github/workflows/test.yml

@@ -48,6 +48,9 @@ jobs:
         with:
           python-version: 3.9
 
+      - name: Install Python dev dependencies
+        run: pipenv install --dev
+
       - name: Run Python unit tests
         run: pipenv run python -m unittest discover -s ./tests/unit