Fix installation with pypy3.7 and pypy3.8

[adriangb]

No description provided.

[codspeed-hq]

CodSpeed Performance Report

Merging #716 will degrade performances by 10.4%

_{Comparing pointless (747149b) with main (081cf31)}

Summary

❌ 1 regressions
✅ 124 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	pointless	Change
❌	test_set_of_ints_core_json_duplicates	4.8 ms	5.4 ms	-10.4%

[codecov]

Codecov Report

Merging #716 (747149b) into main (081cf31) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #716   +/-   ##
=======================================
  Coverage   93.71%   93.71%           
=======================================
  Files          99       99           
  Lines       13838    13838           
  Branches       25       25           
=======================================
  Hits        12968    12968           
  Misses        864      864           
  Partials        6        6           

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