update go from 1.21.3 to 1.21.4

[oliviassss]

Issue

Fix the error in govulncheck as shown in the log

Description

Update go version to 1.21.4 for both deps.yml and BASE_IMAGE

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the docs directory)
• Manually tested
• Made sure the title of the PR is a good description that can go into the release notes

BONUS POINTS checklist: complete for good vibes and maybe prizes?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (82301db) 55.75% compared to head (6e18cef) 55.75%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3484   +/-   ##
=======================================
  Coverage   55.75%   55.75%           
=======================================
  Files         149      149           
  Lines        8843     8843           
=======================================
  Hits         4930     4930           
  Misses       3579     3579           
  Partials      334      334           

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[M00nF1sh]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: M00nF1sh, oliviassss

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[darren-recentive]

Does / should the go.mod file be updated to reflect version upgrade as part of this PR?
https://github.com/kubernetes-sigs/aws-load-balancer-controller/blob/493bb0a5c4e28e75f5ab555dbf31ef14041ba370/go.mod#L3C8-L3C8