Updates markdown-link-check configuration

[edumserrano]

Remove retry logic and adds 429 to the list of accepted status codes. The retry logic was test with #206 and it didn't work.

The 429 is being returned by GitHub due to rate limiting when checking GitHub links.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.02%. Comparing base (f2194dc) to head (22a3b60).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #207   +/-   ##
=======================================
  Coverage   91.02%   91.02%           
=======================================
  Files          44       44           
  Lines         479      479           
  Branches       51       51           
=======================================
  Hits          436      436           
  Misses         35       35           
  Partials        8        8           

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