[PR #5431/751c3c4 backport][3.11] Re-introduce pytest-xdist in supported envs

[bdraco]

Co-authored-by: J. Nick Koston [email protected]
(cherry picked from commit 751c3c4)

[codspeed-hq]

CodSpeed Performance Report

Merging #9747 will not alter performance

_{Comparing patchback/backports/3.11/751c3c4e17d621ffc91b79dccb4e2a5ef8b42888/pr-5431 (f85ba00) with 3.11 (68b2e82)}

Summary

✅ 14 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.11    #9747   +/-   ##
=======================================
  Coverage        ?   97.95%           
=======================================
  Files           ?      117           
  Lines           ?    35955           
  Branches        ?     4313           
=======================================
  Hits            ?    35218           
  Misses          ?      550           
  Partials        ?      187           

Flag	Coverage Δ
CI-GHA	97.83% <100.00%> (?)
OS-Linux	97.53% <100.00%> (?)
OS-Windows	94.48% <100.00%> (?)
OS-macOS	96.75% <100.00%> (?)
Py-3.10.11	96.60% <98.94%> (?)
Py-3.10.15	97.08% <98.94%> (?)
Py-3.11.10	97.15% <98.94%> (?)
Py-3.11.9	96.67% <98.94%> (?)
Py-3.12.7	97.60% <98.94%> (?)
Py-3.13.0	97.59% <98.94%> (?)
Py-3.9.13	96.53% <98.94%> (?)
Py-3.9.20	96.99% <98.94%> (?)
Py-pypy7.3.16	96.57% <98.94%> (?)
VM-macos	96.75% <100.00%> (?)
VM-ubuntu	97.53% <100.00%> (?)
VM-windows	94.48% <100.00%> (?)

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