Upgrade jetty-util version to 9.4.31 (#8035)

Signed-off-by: xiaolong.ran <rxl@apache.org>
diff --git a/pulsar-sql/presto-distribution/LICENSE b/pulsar-sql/presto-distribution/LICENSE
index 6b92488..ebad5b9 100644
--- a/pulsar-sql/presto-distribution/LICENSE
+++ b/pulsar-sql/presto-distribution/LICENSE
@@ -437,12 +437,12 @@
   * Java Assist
     - javassist-3.25.0-GA.jar
   * Jetty
-    - jetty-http-9.4.29.v20200521.jar
-    - jetty-io-9.4.29.v20200521.jar
-    - jetty-security-9.4.29.v20200521.jar
-    - jetty-server-9.4.29.v20200521.jar
-    - jetty-servlet-9.4.29.v20200521.jar
-    - jetty-util-9.4.29.v20200521.jar
+    - jetty-http-9.4.31.v20200723.jar
+    - jetty-io-9.4.31.v20200723.jar
+    - jetty-security-9.4.31.v20200723.jar
+    - jetty-server-9.4.31.v20200723.jar
+    - jetty-servlet-9.4.31.v20200723.jar
+    - jetty-util-9.4.31.v20200723.jar
   * Java Native Access
     - jna-4.2.0.jar
     - jna-5.3.1.jar