Quesnelia: Upgrade Vertx from 4.5.5 to 4.5.9 fixing Snappy vulns

1. Describe issue impact on business Data loss because Kafka crashes. 2. What institutions are affected? (field “Effected Institutions” in Jira to be populated) All institutions that use loans, requests or check-ins. Attackers don't advertise which institutions they will attack. 3. What is the workaround if exists? None. 4. What areas will be impacted by fix (i.e. what areas need to be retested) Upgrading the Vert.x software library patch version doesn't need any testing beyond existing unit tests. 5. Brief explanation of technical implementation and the level of effort (in workdays) and technical risk (low/medium/high) Low. Bump Vert.x software library patch version. 6. Brief explanation of testing required and level of effort (in workdays). Provide test plan agreed with by QA Manager and PO. None beyond existing unit tests. 7. What is the roll back plan in case the fix does not work? Downgrade to previous mod-circulation-storage patch version.