Fix PyPy integration tests in CI. (#1432)
Fix PyPy integration tests in CI. (#1432)

These started failing due to a google-crc32c release that changed the
build system for its native extension:
https://github.com/googleapis/python-crc32c/issues/83

jsirois/pex,pantsbuild/pex,pantsbuild/pex,jsirois/pex