Update activemq version

Author: acoburn

build.gradle

@@ -11,7 +11,7 @@ ext {
 
     /* Dependencies */
     activationApiVersion = '1.2.0'
-    activeMqVersion = '5.15.3'
+    activeMqVersion = '5.15.4'
     commonsCodecVersion = '1.11'
     commonsCollectionsVersion = '4.1'
     commonsIoVersion = '2.6'
@@ -283,7 +283,7 @@ subprojects { subproj ->
             links 'https://trellis-ldp.github.io/trellis/apidocs/'
             links 'https://commons.apache.org/proper/commons-lang/javadocs/api-3.7/'
             links 'https://commons.apache.org/proper/commons-rdf/apidocs/'
-            links 'https://activemq.apache.org/maven/5.15.3/apidocs/'
+            links 'https://activemq.apache.org/maven/5.15.4/apidocs/'
             links 'https://jena.apache.org/documentation/javadoc/rdfconnection/'
             links 'https://kafka.apache.org/0100/javadoc/'
             links 'https://rabbitmq.github.io/rabbitmq-java-client/api/current/'
@@ -330,7 +330,7 @@ configure(rootProject) {
             links 'https://trellis-ldp.github.io/trellis/apidocs/'
             links 'https://commons.apache.org/proper/commons-lang/javadocs/api-3.7/'
             links 'https://commons.apache.org/proper/commons-rdf/apidocs/'
-            links 'https://activemq.apache.org/maven/5.15.3/apidocs/'
+            links 'https://activemq.apache.org/maven/5.15.4/apidocs/'
             links 'https://jena.apache.org/documentation/javadoc/rdfconnection/'
             links 'https://kafka.apache.org/0100/javadoc/'
             links 'https://rabbitmq.github.io/rabbitmq-java-client/api/current/'