Update to groovy 2.4.17

Fixes gh-7209

Author: jzheaux

gradle/dependency-management.gradle

@@ -148,8 +148,8 @@ dependencyManagement {
 		dependency 'org.attoparser:attoparser:2.0.4.RELEASE'
 		dependency 'org.bouncycastle:bcpkix-jdk15on:1.62'
 		dependency 'org.bouncycastle:bcprov-jdk15on:1.58'
-		dependency 'org.codehaus.groovy:groovy-all:2.4.14'
-		dependency 'org.codehaus.groovy:groovy-json:2.4.14'
+		dependency 'org.codehaus.groovy:groovy-all:2.4.17'
+		dependency 'org.codehaus.groovy:groovy-json:2.4.17'
 		dependency 'org.codehaus.groovy:groovy:2.4.14'
 		dependency 'org.eclipse.jdt:ecj:3.12.3'
 		dependency 'org.eclipse.jetty.websocket:websocket-api:9.4.12.v20180830'