ZOOKEEPER-4700: Update Jetty for fixing CVE-2023-26048 and CVE-2023-26049

Change-Id: I18a2da2e104a21e0b248c444077d49e326893f57

Author: Villő Szűcs <szucsvillo@cloudera.com>

Reviewers: andor@apache.org, eolivelli@apache.org, tison@apache.org

Closes #2007 from szucsvillo/ZOOKEEPER-4700

pom.xml

@@ -559,7 +559,7 @@
     <hamcrest.version>2.2</hamcrest.version>
     <commons-cli.version>1.5.0</commons-cli.version>
     <netty.version>4.1.86.Final</netty.version>
-    <jetty.version>9.4.49.v20220914</jetty.version>
+    <jetty.version>9.4.51.v20230217</jetty.version>
     <jackson.version>2.13.4.2</jackson.version>
     <jline.version>2.14.6</jline.version>
     <snappy.version>1.1.9.1</snappy.version>