Third-party tests failed on Fri Oct 11 2024

[github-actions]

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

[JelleZijlstra]

I dropped 3.8 support in pyanalyze. Might be good to just drop all the 3.8 third-party jobs, in the expectation that all the other projects will also drop support in the near future.

For typing-extensions itself I'd like to do one more release supporting 3.8 and then drop it.