JavaKit: add source/target versions to Java2Swift.config #292

Job	Run time
Swift tests (swift:nightly-main jdk:Corretto os:jammy)	4m 7s
Java tests (swift:nightly-main jdk:Corretto os:jammy)	5m 22s
soundness / Broken symlinks check	4s
soundness / Documentation check	36s
soundness / License headers check	6s
soundness / API breakage check	0s
soundness / Unacceptable language check	3s
soundness / Format check	0s
soundness / Python lint check	6s
soundness / Shell check	33s
soundness / YAML lint check	8s
	11m 5s

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