Add verified_at to GHVerification

[finlaysawyer]

Description

Adds support for verified_at, which is included in the verification response for verified commits.

https://docs.github.com/en/rest/commits/commits?apiVersion=2026-03-10#get-a-commit

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.30%. Comparing base (3622553) to head (36b00d4).

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #2269   +/-   ##
=========================================
  Coverage     85.30%   85.30%           
- Complexity     2553     2554    +1     
=========================================
  Files           241      241           
  Lines          7540     7541    +1     
  Branches        396      396           
=========================================
+ Hits           6432     6433    +1     
  Misses          872      872           
  Partials        236      236           

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