v5.4.9

Change log:

bed7640 Upgrade dependencies; prepare for release
2858954 GH-3584: Support spring-amqp 2.3.x and 2.4.x
ddab28a Fix pattern how Lock.unlock() is used
70f6ceb Make MessageHistory JSON-serializable
f0d1260 Fix SourcePollingChAdFB autoStartup propagation
ed47b56 Remove unused imports
836a11b Fix NPE for @Indexed in the MessagingGatewayReg
46acf0c Fix CORS registration for IntGraphController