Drop pypy3.9, since it's not available on GitHub actions.

.github/workflows/pythontest.yml

@@ -13,14 +13,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
         python-version:
-          ["3.7", "3.8", "3.9", "3.10", "3.11", "pypy3.9"]
-        exclude:
-          # sqlite3 exit handling seems to get in the way
-          - os: macos-latest
-            python-version: pypy3
-          # doesn't support passing in bytestrings to os.scandir
-          - os: windows-latest
-            python-version: pypy3
+          ["3.7", "3.8", "3.9", "3.10", "3.11"]
       fail-fast: false
 
     steps: