Update async-http-client to 2.12.4 in series/0.24

Author: http4s-steward[bot]

build.sbt

@@ -21,7 +21,7 @@ ThisBuild / startYear := Some(2013)
 
 lazy val root = tlCrossRootProject.aggregate(servlet, examples)
 
-val asyncHttpClientVersion = "2.12.3"
+val asyncHttpClientVersion = "2.12.4"
 val jettyVersion = "12.0.23"
 val http4sVersion = "0.23.30"
 val munitCatsEffectVersion = "2.1.0"