fix: fix staticcheck issues in the verifier pkg

[qba73]

This PR:

• addresses issues highlighted by staticcheck (ref: Staticcheck reports using deprecated functions/methods and structs #531)
• fixes in this PR are limited to the package verifier

[codecov]

Codecov Report

Attention: Patch coverage is 42.85714% with 8 lines in your changes missing coverage. Please review.

Project coverage is 81.47%. Comparing base (6063ebe) to head (1866537).

Files with missing lines	Patch %	Lines
verifier/verifier.go	42.85%	8 Missing ⚠️

❌ Your patch status has failed because the patch coverage (42.85%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #537   +/-   ##
=======================================
  Coverage   81.47%   81.47%           
=======================================
  Files          36       36           
  Lines        3358     3358           
=======================================
  Hits         2736     2736           
  Misses        480      480           
  Partials      142      142           

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[ghost]

LGTM

[ghost]

@qba73 Looks like the test coverage is below the patch target. Please see the Codecov report for details: #537 (comment)

[github-actions]

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