Switch to PyPy nightly

[A5rocks]

See #3433, let's see if nightly PyPy has already fixed the issue.

(also a PR for debugging if not)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.94850%. Comparing base (ec668d1) to head (6276885).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@                 Coverage Diff                  @@
##                 main       #3434         +/-   ##
====================================================
- Coverage   100.00000%   99.94850%   -0.05151%     
====================================================
  Files             128         128                 
  Lines           19418       19418                 
  Branches         1318        1318                 
====================================================
- Hits            19418       19408         -10     
- Misses              0           7          +7     
- Partials            0           3          +3     

see 5 files with indirect coverage changes

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[A5rocks]

Next PyPy issue: pypy/pypy#5458