Fix deprecation warnings for witty

[tlambert03]

also pins to witty >=0.3

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.03%. Comparing base (75b9279) to head (8d7bce2).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #42   +/-   ##
=======================================
  Coverage   95.03%   95.03%           
=======================================
  Files          12       12           
  Lines         383      383           
=======================================
  Hits          364      364           
  Misses         19       19           

☔ View full report in Codecov by Sentry.
📢 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.

[codspeed-hq]

CodSpeed Performance Report

Merging #42 will not alter performance

_{Comparing tlambert03:fix-witty (8d7bce2) with main (75b9279)}

Summary

✅ 6 untouched benchmarks