PHOENIX-6488 Bump Avatica version to 1.18.0 in queryserver

also update jetty to 9.4.31.v20200723
diff --git a/pom.xml b/pom.xml
index 5210728..4c93d80 100644
--- a/pom.xml
+++ b/pom.xml
@@ -80,12 +80,12 @@
         <curator.version>2.12.0</curator.version>
 
         <gson.version>2.2.4</gson.version>
-        <jetty.version>9.4.15.v20190215</jetty.version>
+        <jetty.version>9.4.31.v20200723</jetty.version>
         <commons-io.version>2.5</commons-io.version>
         <commons-collections.version>3.2.2</commons-collections.version>
         <sqlline.version>1.9.0</sqlline.version>
         <slf4j.version>1.7.30</slf4j.version>
-        <avatica.version>1.16.0</avatica.version>
+        <avatica.version>1.18.0</avatica.version>
         <servlet.api.version>3.1.0</servlet.api.version>
         <jsr305.version>3.0.0</jsr305.version>