[3.0.x] update async-http-client to 2.12.4

[xuwei-k]

Pull Request Checklist

• Have you read through the contributor guidelines?
• Have you squashed your commits?
• Have you added copyright headers to new files?
• Have you checked that both Scala and Java APIs are updated?
• Have you updated the documentation for both Scala and Java sections?
• Have you added tests for any changed functionality?

Fixes

Purpose

Background Context

References

AsyncHttpClient/async-http-client@async-http-client-project-2.12.3...async-http-client-project-2.12.4

[mkurz]

Hmm.. I can not see the 2.12.4 tag, "only" this branch: https://github.com/AsyncHttpClient/async-http-client/tree/2.12.4-cve-fix

[xuwei-k]

AsyncHttpClient/async-http-client#2033 (comment)

[hyperxpro]

Renamed branch to 2.14.2 and added tag async-http-client-project-2.12.4

[mkurz]

Got merged as part of:

• Patch updates #973
• [3.0.x] Patch updates #977
• [2.2.x] Patch updates #975