Update dependency nginx/agent to v3.3.1 (#3934)

[ciarams87]

Cherry-picked from (#3934)

Proposed changes

• Update dependency nginx/agent to v3.3.1

datasource	package	from	to
github-tags	nginx/agent	v3.3.0	v3.3.1

• Update all agent version refs

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 86.90%. Comparing base (39a3878) to head (e9b7019).
⚠️ Report is 1 commits behind head on release-2.1.

Additional details and impacted files

@@ Coverage Diff @@ ## release-2.1 #3935 +/- ## =============================================== + Coverage 86.85% 86.90% +0.04%  =============================================== Files 128 128 Lines 16029 16029 Branches 62 62 =============================================== + Hits 13922 13930 +8  + Misses 1937 1931 -6  + Partials 170 168 -2 

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