Update jetty.version

Author: mend-for-github-com[bot]

pom.xml

@@ -11,7 +11,7 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <jetty.version>9.4.12.v20180830</jetty.version>
+        <jetty.version>9.4.16.v20190411</jetty.version>
         <jersey.version>2.27</jersey.version>
         <jackson.version>2.8.10</jackson.version>
     </properties>