Update async-http-client to 2.9.0 (#2589)
Update async-http-client to 2.9.0 (#2589)

Update async-http-client to 2.9.0
http4s/http4s,ChristopherDavenport/http4s,rossabaker/http4s,aeons/http4s,rossabaker/http4s,aeons/http4s,aeons/http4s,ChristopherDavenport/http4s,ChristopherDavenport/http4s