Bump activemq-core from 5.2.0 to 5.6.0 in /testing/itest/jms

Bumps activemq-core from 5.2.0 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>
1 file changed