Skip building the PyPy 3.7 wheel for macOS

Numpy doesn't have a wheel on PyPI for this combination and it fails
to install since macos-latest has changed to version 11.

Author: nsoranzo

.github/workflows/deploy.yaml

@@ -30,7 +30,9 @@ jobs:
           CIBW_ARCHS: ${{matrix.arch}}
           # Skip building musllinux wheels for aarch64, each one currently takes
           # more than 2 hours to build.
-          CIBW_SKIP: '*-musllinux_aarch64'
+          # Skip also building the PyPy 3.7 wheel for macOS, because numpy
+          # doesn't have a wheel on PyPI and it fails to install.
+          CIBW_SKIP: '*-musllinux_aarch64 pp37-macosx_x86_64'
       - name: Check packages
         run: twine check dist/*
       - uses: actions/upload-artifact@v2