Bump JDK used in CI #989

Job	Run time
Build with no staging repository, using only central-released artifacts	2m 22s
Test on JDK 21	2m 18s
Smoke Tests imqadmin @ Java 11	10s
Smoke Tests imqbridgemgr @ Java 11	14s
Smoke Tests imqbrokerd @ Java 11	11s
Smoke Tests imqcmd @ Java 11	11s
Smoke Tests imqdbmgr @ Java 11	15s
Smoke Tests imqobjmgr @ Java 11	23s
Smoke Tests imqusermgr @ Java 11	15s
Smoke Tests imqadmin @ Java 17	12s
Smoke Tests imqbridgemgr @ Java 17	11s
Smoke Tests imqbrokerd @ Java 17	13s
Smoke Tests imqcmd @ Java 17	12s
Smoke Tests imqdbmgr @ Java 17	10s
Smoke Tests imqobjmgr @ Java 17	14s
Smoke Tests imqusermgr @ Java 17	11s
Smoke Tests imqadmin @ Java 21	13s
Smoke Tests imqbridgemgr @ Java 21	22s
Smoke Tests imqbrokerd @ Java 21	15s
Smoke Tests imqcmd @ Java 21	11s
Smoke Tests imqdbmgr @ Java 21	10s
Smoke Tests imqobjmgr @ Java 21	12s
Smoke Tests imqusermgr @ Java 21	10s
Test MQCRT Library on ubuntu-latest/JDK 17	47s
Test MQCRT Library on ubuntu-latest/JDK 21	51s
Test MQCRT Library on macos-latest/JDK 17	58s
Test MQCRT Library on macos-latest/JDK 21	1m 2s
	12m 53s

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