Exclude PyPy+Windows from test matrix

Author: abravalheri

.github/workflows/main.yml

@@ -29,6 +29,11 @@ jobs:
         - platform: ubuntu-latest
           python: "3.10"
           distutils: stdlib
+        exclude:
+        # The combination of PyPy+Windows+pytest-xdist+ProcessPoolExecutor is flaky/problematic
+        - platform: windows-2019
+          python: pypy-3.7
+          distutils: local
     runs-on: ${{ matrix.platform }}
     env:
       SETUPTOOLS_USE_DISTUTILS: ${{ matrix.distutils }}