test on pypy 3.8 and pypy 3.9 on windows and macos (#6424)

Author: graingert

.github/workflows/run-tests.yml

@@ -12,14 +12,13 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12-dev"]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12-dev", "pypy-3.8", "pypy-3.9"]
         os: [ubuntu-22.04, macOS-latest, windows-latest]
         include:
-          # pypy-3.7 on Mac OS currently fails trying to compile
-          # brotlipy. Moving pypy3 to only test linux.
+          # pypy-3.7 on Windows and Mac OS currently fails trying to compile
+          # cryptography. Moving pypy-3.7 to only test linux.
           - python-version: pypy-3.7
             os: ubuntu-latest
-            experimental: false
 
     steps:
     - uses: actions/checkout@v2