Update NGINX Agent to v3.5.1

[sjberman]

https://github.com/nginx/agent/releases/tag/v3.5.1

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.15%. Comparing base (9af2858) to head (b2474af).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4372   +/-   ##
=======================================
  Coverage   86.15%   86.15%           
=======================================
  Files         132      132           
  Lines       14343    14343           
  Branches       35       35           
=======================================
  Hits        12357    12357           
  Misses       1784     1784           
  Partials      202      202           

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