py(deps): Add pytest-xdist

[tony]

Changes

Add pytest-xdist dev package

See also:

• https://pypi.org/project/pytest-xdist/
• https://github.com/pytest-dev/pytest-xdist

See also

• pytest-xdist support, test stability libtmux#522

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.19%. Comparing base (296276d) to head (6f5c073).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #930   +/-   ##
=======================================
  Coverage   70.19%   70.19%           
=======================================
  Files          26       26           
  Lines        1936     1936           
  Branches      404      404           
=======================================
  Hits         1359     1359           
  Misses        454      454           
  Partials      123      123           

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