JavaKit: add source/target versions to Java2Swift.config #297

Job	Run time
Java tests (swift:nightly-main jdk:Corretto os:jammy)	7m 23s
Swift tests (swift:nightly-main jdk:Corretto os:jammy)	6m 8s
soundness / API breakage check	0s
soundness / Format check	0s
soundness / Documentation check	40s
soundness / Broken symlinks check	4s
soundness / License headers check	4s
soundness / Shell check	31s
soundness / Unacceptable language check	2s
soundness / Python lint check	6s
soundness / YAML lint check	3s
	15m 1s

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