Drop PyPy 3.9 and PyPy 3.10 support (both no longer supported upstream)

[MarshalX]

No description provided.

[codspeed-hq]

CodSpeed Performance Report

Merging #77 will create unknown performance changes

_{Comparing drop-pypy-39-and-310 (f675ae2) with main (dcacdfb)}

Summary

⚠️ No benchmarks were detected in both the base of the PR and the PR.
Please ensure that your benchmarks are correctly instrumented with CodSpeed.

Check out the benchmarks creation guide

⏩ 192 skipped¹

Footnotes

1. 192 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩