Bump activemq-core from 5.3.0 to 5.6.0 in /features/eclipse-pde

Bumps activemq-core from 5.3.0 to 5.6.0.

---
updated-dependencies:
- dependency-name: org.apache.activemq:activemq-core
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/features/eclipse-pde/pom.xml b/features/eclipse-pde/pom.xml
index df6adaa..74f292d 100644
--- a/features/eclipse-pde/pom.xml
+++ b/features/eclipse-pde/pom.xml
@@ -61,7 +61,7 @@
         <dependency>
             <groupId>org.apache.activemq</groupId>
             <artifactId>activemq-core</artifactId>
-            <version>5.3.0</version>
+            <version>5.6.0</version>
             <exclusions>
                <exclusion>
                    <groupId>org.springframework</groupId>