Fix install of pygame on Python 3.11

See pygame/pygame#3522 (comment).

Author: PeterJCLaw

.github/workflows/python-test.yml

@@ -37,7 +37,10 @@ jobs:
         flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
     - name: Check with mypy
       run: |
-        pip install pygame   # Needed for examples
+        # --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
         mypy pythonosc examples
     - name: Test with pytest
       run: |