Bump activemq.version from 5.17.3 to 5.18.6

Bumps `activemq.version` from 5.17.3 to 5.18.6.

Updates `org.apache.activemq:activemq-broker` from 5.17.3 to 5.18.6
- [Commits](apache/activemq@activemq-5.17.3...activemq-5.18.6)

Updates `org.apache.activemq:activemq-mqtt` from 5.17.3 to 5.18.6
- [Commits](apache/activemq@activemq-5.17.3...activemq-5.18.6)

Updates `org.apache.activemq:activemq-kahadb-store` from 5.17.3 to 5.18.6
- [Commits](apache/activemq@activemq-5.17.3...activemq-5.18.6)

---
updated-dependencies:
- dependency-name: org.apache.activemq:activemq-broker
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.apache.activemq:activemq-mqtt
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.apache.activemq:activemq-kahadb-store
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

pom.xml

@@ -39,7 +39,7 @@
         <project.build.outputTimestamp>10</project.build.outputTimestamp>
         <baseline>1.0.0</baseline>
         <baseline.skip>true</baseline.skip>
-        <activemq.version>5.17.3</activemq.version>
+        <activemq.version>5.18.6</activemq.version>
         <camel.version>3.22.3</camel.version>
         <cassandra.driver.version>4.9.0</cassandra.driver.version>
         <glassfish-json.version>1.1.4</glassfish-json.version>