fix(git-node): allow security release promotion

[aduh95]

In order to promote a security release using this script:

• your local HEAD should be the release proposal commit
• ncu config upstream should point to the public repo (NOT the private one)

N.B.: At the end of the process, it won't tell you to push to the private repo, until you do that manually the release proposal won't auto-close.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.08%. Comparing base (cce9b81) to head (e7573e6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #900   +/-   ##
=======================================
  Coverage   80.08%   80.08%           
=======================================
  Files          39       39           
  Lines        4676     4676           
=======================================
  Hits         3745     3745           
  Misses        931      931           

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