Use updated sigstore/sigstore KMS clients with HashFunc method

[malancas]

Summary

Release Note

Documentation

[codecov]

Codecov Report

Attention: 18 lines in your changes are missing coverage. Please review.

Comparison is base (72f8454) 52.85% compared to head (124ac71) 53.05%.
Report is 8 commits behind head on main.

❗ Current head 124ac71 differs from pull request most recent head 011e9ee. Consider uploading reports for the commit 011e9ee to get more accurate results

Files	Patch %	Lines
pkg/signer/tink.go	68.96%	9 Missing ⚠️
pkg/signer/signer.go	37.50%	5 Missing ⚠️
pkg/signer/file.go	60.00%	2 Missing ⚠️
pkg/signer/memory.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #517      +/-   ##
==========================================
+ Coverage   52.85%   53.05%   +0.19%     
==========================================
  Files          20       20              
  Lines        1209     1229      +20     
==========================================
+ Hits          639      652      +13     
- Misses        509      516       +7     
  Partials       61       61              

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