fix CI build issues on dev branch

[evie404]

Proposed change

While working on unrelated change (#3257), I found CI is broken due to upstream changes in test setup: zigpy/workflows@248b545

Pinning workflow to the commit before the breaking change.

Additional information

Checklist

• The changes are tested and work correctly
• pre-commit checks pass / the code has been formatted using Black
• Tests have been added to verify that the new code works

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.18%. Comparing base (8317dc6) to head (8abc1d2).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #3258   +/-   ##
=======================================
  Coverage   88.18%   88.18%           
=======================================
  Files         301      301           
  Lines        9412     9412           
=======================================
  Hits         8300     8300           
  Misses       1112     1112           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[TheJulianJES]

Thanks for the PR!
We'll go with this PR for fixing CI and keeping xdist:

• Fix CI #3272

If you want, feel free to PR your README changes separately.

[evie404]

ty for fixing the dev branch :)