Update NGINX and NGINX Agent versions

[sjberman]

NGINX: 1.29.0
NGINX Agent: 3.1.0

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

Release notes

If this PR introduces a change that affects users and needs to be mentioned in the release notes,
please add a brief note that summarizes the change.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.87%. Comparing base (35d3e7e) to head (94d3ee0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3607      +/-   ##
==========================================
- Coverage   86.90%   86.87%   -0.04%     
==========================================
  Files         127      127              
  Lines       15271    15271              
  Branches       62       62              
==========================================
- Hits        13271    13266       -5     
- Misses       1847     1851       +4     
- Partials      153      154       +1     

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