Update jetty-client, jetty-server, ... to 9.4.19.v20190610

Author: scala-steward

build.sbt

@@ -13,7 +13,7 @@ val guavaVersion = "23.0"
 val jsr305Version = "3.0.2"
 val scalatestVersion = "3.0.5"
 val scalacheckVersion = "1.14.0"
-val jettyVersion = "9.4.18.v20190429"
+val jettyVersion = "9.4.19.v20190610"
 val mongoVersion = "3.7.0"
 val kafkaVersion = "2.2.1"
 val mongoScalaVersion = "2.3.0"