Third-party tests failed on Tue Jul 18 2023

[github-actions]

Runs listed here: https://github.com/python/typing_extensions/actions/workflows/third_party.yml

[hauntsaninja]

PyYAML made a new release that breaks on PyPy and YAML is everywhere so now no tests running on PyPy pass

[AlexWaygood]

so now no tests running on PyPy pass

looks like it's just the cattrs tests that are failing on PyPy for us, thankfully