use go1.22.6 to build cosign

[cpanato]

• use go1.22.6 to build cosign

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.69%. Comparing base (2ef6022) to head (6f4c3f2).
Report is 211 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3862      +/-   ##
==========================================
- Coverage   40.10%   36.69%   -3.41%     
==========================================
  Files         155      203      +48     
  Lines       10044    12780    +2736     
==========================================
+ Hits         4028     4690     +662     
- Misses       5530     7507    +1977     
- Partials      486      583      +97     

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