Update cosign to v2.6.0 and go in the CI to latest version

[ccojocar]

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[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.56%. Comparing base (1216c9b) to head (fa942b8).
⚠️ Report is 107 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1389      +/-   ##
==========================================
- Coverage   68.49%   62.56%   -5.94%     
==========================================
  Files          75       76       +1     
  Lines        4384     5345     +961     
==========================================
+ Hits         3003     3344     +341     
- Misses       1233     1867     +634     
+ Partials      148      134      -14     

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