Update async-http-client to 2.12.3

[scala-steward]

Updates org.asynchttpclient:async-http-client from 2.8.1 to 2.12.3.

I'll automatically update this PR to resolve conflicts as long as you don't change it yourself.

If you'd like to skip this version, you can just close this PR. If you have any feedback, just mention me in the comments below.

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Have a fantastic day writing Scala!

Files still referring to the old version number

The following files still refer to the old version number (2.8.1).
You might want to review and update them manually.

project/src/main/scala/Build.scala
project/src/main/scala/modules/core.scala

Adjust future updates

Add this to your .scala-steward.conf file to ignore future updates of this dependency:

updates.ignore = [ { groupId = "org.asynchttpclient", artifactId = "async-http-client" } ]

Or, add this to slow down future updates of this dependency:

dependencyOverrides = [{
  pullRequests = { frequency = "@monthly" },
  dependency = { groupId = "org.asynchttpclient", artifactId = "async-http-client" }
}]

labels: library-update, early-semver-minor, semver-spec-minor, old-version-remains, commit-count:1

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (fa02cc3) 82.41% compared to head (514899c) 82.41%.
Report is 18 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1669   +/-   ##
=======================================
  Coverage   82.41%   82.41%           
=======================================
  Files          93       93           
  Lines        7326     7326           
  Branches      869      869           
=======================================
  Hits         6038     6038           
  Misses       1288     1288           

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