Bump async-http-client from 2.10.4 to 2.12.1
Bump async-http-client from 2.10.4 to 2.12.1

Bumps [async-http-client](https://github.com/AsyncHttpClient/async-http-client) from 2.10.4 to 2.12.1.
- [Release notes](https://github.com/AsyncHttpClient/async-http-client/releases)
- [Changelog](https://github.com/AsyncHttpClient/async-http-client/blob/master/CHANGES.md)
- [Commits](https://github.com/AsyncHttpClient/async-http-client/compare/async-http-client-project-2.10.4...async-http-client-project-2.12.1)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
cloudbees/zendesk-java-client