Bump cosign to v2.2.3

[priyawadhwa]

addresses the removal of the CertSubject function in cosign in sigstore/cosign#3467

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 54.33%. Comparing base (475fe98) to head (dc7473a).
Report is 28 commits behind head on main.

Files	Patch %	Lines
pkg/webhook/validator.go	50.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1270      +/-   ##
==========================================
- Coverage   54.69%   54.33%   -0.37%     
==========================================
  Files          44       44              
  Lines        4841     3839    -1002     
==========================================
- Hits         2648     2086     -562     
+ Misses       1977     1539     -438     
+ Partials      216      214       -2     

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