Merge pull request #190 from http4s/update/series/0.25/jetty-server-11.0.15

Update jetty-client, jetty-runner, ... to 11.0.15 in series/0.25

Author: rossabaker

build.sbt

@@ -21,7 +21,7 @@ ThisBuild / tlJdkRelease := Some(8)
 lazy val root = tlCrossRootProject.aggregate(servlet, examples)
 
 val asyncHttpClientVersion = "2.12.3"
-val jettyVersion = "11.0.13"
+val jettyVersion = "11.0.15"
 val http4sVersion = "0.23.17"
 val munitCatsEffectVersion = "1.0.7"
 val servletApiVersion = "5.0.0"