Bump async-http-client from 1.7.17 to 1.9.0 in /server

Bumps [async-http-client](https://github.com/AsyncHttpClient/async-http-client) from 1.7.17 to 1.9.0.
- [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-1.7.17...async-http-client-1.9.0)

---
updated-dependencies:
- dependency-name: com.ning:async-http-client
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>
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