Pin a specific pygame version for Python 3.7

Works around pygame/pygame#3572

Author: PeterJCLaw

.github/workflows/python-test.yml

@@ -40,7 +40,8 @@ jobs:
         # --pre needed for Python 3.11 which doesn't have wheels (and may not be
         # fully supported) in version 2.1.2. Once 2.1.3 is released the --pre
         # can be removed.
-        pip install --pre pygame   # Needed for examples
+        # Version pin to 2.1.3-dev4 needed for Python 3.7 due to https://github.com/pygame/pygame/issues/3572
+        pip install --pre pygame==2.1.3-dev4   # Needed for examples
         mypy pythonosc examples
     - name: Test with pytest
       run: |