bump release to use go 1.21.8

[bobcallaway]

Summary

Release Note

Documentation

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 40.45%. Comparing base (2ef6022) to head (7bd3911).
Report is 38 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3583      +/-   ##
==========================================
+ Coverage   40.10%   40.45%   +0.35%     
==========================================
  Files         155      155              
  Lines       10044    10078      +34     
==========================================
+ Hits         4028     4077      +49     
+ Misses       5530     5508      -22     
- Partials      486      493       +7     

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[cpanato]

Need to bump the validate release ci job as well

I have a branch for that just did not have time today

Thanks for doing this

[cpanato]

Thanks

The same should go for Fulcio and rekor