feat(git-node): verify tag with official keyring

[aduh95]

Instead of trying to parse git tag output (which is not stable), we could simply download the keyring from nodejs/release-keys and rely on the exit code. It should no longer provide false negatives.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.73%. Comparing base (9b642b0) to head (a176326).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #989   +/-   ##
=======================================
  Coverage   79.73%   79.73%           
=======================================
  Files          39       39           
  Lines        4664     4664           
=======================================
  Hits         3719     3719           
  Misses        945      945           

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[targos]

still LGTM