Update NGINX and NGINX Agent

[sjberman]

NGINX to 1.29.4
Agent to 3.6.1

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.23%. Comparing base (c2f7394) to head (6e339e0).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4469      +/-   ##
==========================================
- Coverage   86.24%   86.23%   -0.01%     
==========================================
  Files         132      132              
  Lines       14566    14566              
  Branches       35       35              
==========================================
- Hits        12562    12561       -1     
  Misses       1791     1791              
- Partials      213      214       +1     

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