Update sigstore/sigstore dependencies

[malancas]

Summary

Supersedes #773. A few of the workflows on that PR were failing because go mod tidy had to be run. After updating the dependencies, running go mod tidy, and running unit tests with make test, some of the generated restapi and client content was also regenerated.

Release Note

Documentation

[codecov]

Codecov Report

Attention: Patch coverage is 10.20408% with 44 lines in your changes missing coverage. Please review.

Project coverage is 45.92%. Comparing base (6fd19b0) to head (716c9cf).
Report is 131 commits behind head on main.

Files	Patch %	Lines
pkg/generated/client/timestamp/timestamp_client.go	4.00%	24 Missing ⚠️
...nt/timestamp/get_timestamp_cert_chain_responses.go	0.00%	10 Missing ⚠️
...ient/timestamp/get_timestamp_response_responses.go	16.66%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #774      +/-   ##
==========================================
- Coverage   52.85%   45.92%   -6.94%     
==========================================
  Files          20       55      +35     
  Lines        1209     2942    +1733     
==========================================
+ Hits          639     1351     +712     
- Misses        509     1451     +942     
- Partials       61      140      +79     

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[cpanato]

thanks