docs: update Jenkins token creation link.

[juanarbol]

The https://ci.nodejs.org/user/<your-github-username>/configure is a 404, instead the url should be
https://ci.nodejs.org/user/<your-github-username>/security.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.22%. Comparing base (0b3d22d) to head (b7644f5).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #936   +/-   ##
=======================================
  Coverage   80.22%   80.22%           
=======================================
  Files          39       39           
  Lines        4631     4631           
=======================================
  Hits         3715     3715           
  Misses        916      916           

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