fix: Use JDK 17 for Jitpack builds #217

Job	Run time
JDK 25 - ubuntu-latest build (stable)	1m 37s
JDK 17 - macos-15 ios (stable)	21m 13s
JDK 17 - ubuntu-latest flutter-android (stable)	7m 8s
JDK 21 - ubuntu-latest build (snapshot)	51s
JDK 17 - ubuntu-latest android (stable)	5m 30s
JDK 21 - ubuntu-latest build (stable)	1m 33s
JDK 17 - macos-15 flutter-ios (stable)	23m 11s
JDK 25 - ubuntu-latest build (snapshot)	47s
JDK 17 - ubuntu-latest build (snapshot)	41s
	1h 2m 31s

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