Mark PyPy CI flake as xfail

[akx]

(The earlier fix accidentally slipped into master 🤦)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.68%. Comparing base (ef1e05a) to head (c387f76).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1197   +/-   ##
=======================================
  Coverage   91.68%   91.68%           
=======================================
  Files          27       27           
  Lines        4691     4691           
=======================================
  Hits         4301     4301           
  Misses        390      390           

Flag	Coverage Δ
macos-14-3.10	90.72% <ø> (ø)
macos-14-3.11	90.66% <ø> (ø)
macos-14-3.12	90.87% <ø> (ø)
macos-14-3.13	90.87% <ø> (ø)
macos-14-3.8	90.59% <ø> (ø)
macos-14-3.9	90.65% <ø> (ø)
macos-14-pypy3.10	90.72% <ø> (ø)
ubuntu-24.04-3.10	90.74% <ø> (ø)
ubuntu-24.04-3.11	90.68% <ø> (ø)
ubuntu-24.04-3.12	90.89% <ø> (ø)
ubuntu-24.04-3.13	90.89% <ø> (ø)
ubuntu-24.04-3.8	90.61% <ø> (ø)
ubuntu-24.04-3.9	90.67% <ø> (ø)
ubuntu-24.04-pypy3.10	90.53% <ø> (?)
windows-2022-3.10	90.73% <ø> (ø)
windows-2022-3.11	90.67% <ø> (?)
windows-2022-3.12	90.88% <ø> (?)
windows-2022-3.13	90.88% <ø> (?)
windows-2022-3.8	90.71% <ø> (ø)
windows-2022-3.9	90.66% <ø> (ø)
windows-2022-pypy3.10	90.73% <ø> (?)

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