fix: pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-ORGAPACHEACTIVEMQ-6039483
- https://snyk.io/vuln/SNYK-JAVA-ORGAPACHEACTIVEMQ-6039484

pom.xml

@@ -43,7 +43,7 @@
         <url>https://github.com/zapodot/embedded-jms-junit</url>
     </scm>
     <properties>
-        <activemq.version>5.15.10</activemq.version>
+        <activemq.version>5.15.16</activemq.version>
         <camel.version>2.24.1</camel.version>
         <guava.version>28.1-jre</guava.version>
         <java.version>1.8</java.version>