Bump activemq-core in /testing/itest/async-interactions

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