Drop dep, downgrade Go version directive to 1.25.0

[Hayden-IO]

With the new sigstore/sigstore library, we dropped a dependency which allows us to downgrade the version here as well. This should be a no-op.

Summary

Release Note

Documentation

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 30.63%. Comparing base (41b9037) to head (5185bb1).

Files with missing lines	Patch %	Lines
internal/signerverifier/file.go	50.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #807      +/-   ##
==========================================
+ Coverage   30.60%   30.63%   +0.03%     
==========================================
  Files          62       62              
  Lines        3369     3372       +3     
==========================================
+ Hits         1031     1033       +2     
  Misses       2222     2222              
- Partials      116      117       +1     

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