Drop the java.toolchain version to 17, which has a Corretto LTS release #702

Job	Run time
Test (Java) (jammy swift:6.1.2 jdk:corretto)	2m 2s
Benchmark (JMH) (jammy swift:6.1.2 jdk:corretto)	2m 13s
Test (Java) (macos swift:6.1.2 jdk:corretto)	2m 36s
Test (Swift) (macos swift:6.1.2 jdk:corretto)	3m 26s
Test (Swift) (jammy swift:6.1.2 jdk:corretto)	5m 50s
Sample JavaDependencySampleApp (jammy swift:6.1.2 jdk:corretto)	6m 43s
Sample JavaProbablyPrime (jammy swift:6.1.2 jdk:corretto)	4m 36s
Sample SwiftAndJavaJarSampleLib (jammy swift:6.1.2 jdk:corretto)	2m 21s
Sample SwiftAndJavaJarSampleLib (macos swift:6.1.2 jdk:corretto)	4m 37s
Sample JExtractJNISampleApp (jammy swift:6.1.2 jdk:corretto)	2m 3s
Sample JavaKitSampleApp (macos swift:6.1.2 jdk:corretto)	4m 47s
Sample JavaKitSampleApp (jammy swift:6.1.2 jdk:corretto)	4m 42s
Sample JavaSieve (macos swift:6.1.2 jdk:corretto)	2m 48s
Sample JavaDependencySampleApp (macos swift:6.1.2 jdk:corretto)	5m 46s
Sample JavaProbablyPrime (macos swift:6.1.2 jdk:corretto)	4m 44s
Sample SwiftKitSampleApp (jammy swift:6.1.2 jdk:corretto)	2m 4s
Sample JavaSieve (jammy swift:6.1.2 jdk:corretto)	2m 0s
Sample JExtractJNISampleApp (macos swift:6.1.2 jdk:corretto)	4m 29s
Sample SwiftKitSampleApp (macos swift:6.1.2 jdk:corretto)	5m 12s
soundness / Documentation check	35s
soundness / Unacceptable language check	5s
soundness / License headers check	7s
soundness / Broken symlinks check	4s
soundness / Format check	-1s
soundness / Shell check	39s
soundness / YAML lint check	5s
soundness / API breakage check	-1s
soundness / Python lint check	6s
	1h 14m 38s

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