PHOENIX-5548 Upgrade Jetty to 9.3.27.v20190418

Signed-off-by: Josh Elser <elserj@apache.org>
diff --git a/pom.xml b/pom.xml
index 511e32d..a4e40d6 100644
--- a/pom.xml
+++ b/pom.xml
@@ -107,7 +107,7 @@
     <jodatime.version>1.6</jodatime.version>
     <joni.version>2.1.2</joni.version>
     <avatica.version>1.12.0</avatica.version>
-    <jetty.version>9.3.19.v20170502</jetty.version>
+    <jetty.version>9.3.27.v20190418</jetty.version>
     <tephra.version>0.15.0-incubating</tephra.version>
     <omid.version>1.0.1</omid.version>
     <spark.version>2.4.0</spark.version>