bump k8s versions we're testing against, scaffolding release

[bobcallaway]

$title

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.51%. Comparing base (2ef6022) to head (580b15d).
Report is 293 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4044      +/-   ##
==========================================
- Coverage   40.10%   36.51%   -3.60%     
==========================================
  Files         155      209      +54     
  Lines       10044    13347    +3303     
==========================================
+ Hits         4028     4873     +845     
- Misses       5530     7853    +2323     
- Partials      486      621     +135     

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[bobcallaway]

needs sigstore/community#541