NIFI-8705 - Upgrade Jetty to 9.4.42.v20210604

This closes #5161

Signed-off-by: David Handermann <exceptionfactory@apache.org>
diff --git a/pom.xml b/pom.xml
index 20b4bde..77b45aa 100644
--- a/pom.xml
+++ b/pom.xml
@@ -95,7 +95,7 @@
         <org.bouncycastle.version>1.68</org.bouncycastle.version>
         <org.slf4j.version>1.7.30</org.slf4j.version>
         <ranger.version>2.1.0</ranger.version>
-        <jetty.version>9.4.40.v20210413</jetty.version>
+        <jetty.version>9.4.42.v20210604</jetty.version>
         <jackson.version>2.12.2</jackson.version>
         <nifi.groovy.version>2.5.6</nifi.groovy.version>
         <surefire.version>2.22.2</surefire.version>