fix: kw_only dataclass inheritance mis-ordering.

[DanCardin]

Fixes #269

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.45%. Comparing base (2160ccb) to head (07eb30e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #270   +/-   ##
=======================================
  Coverage   99.45%   99.45%           
=======================================
  Files          28       28           
  Lines        2958     2960    +2     
  Branches      670      671    +1     
=======================================
+ Hits         2942     2944    +2     
  Misses         12       12           
  Partials        4        4           

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

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.