Java GraalVM CI

Bump graalvm/setup-graalvm from 1.1.5 to 1.2.6 #1078

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Run time

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Job	Run time
GraalVM - windows-2019	8m 39s
GraalVM - ubuntu-latest	7m 20s
GraalVM - macos-latest	9m 55s
	25m 54s