Scala build and test

Update sbt, scripted-plugin to 1.12.0 #504

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Run time

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Job	Run time
test-assembly	1m 3s
test (ubuntu-latest, 21)	1m 20s
test (ubuntu-latest, 17)	1m 16s
test (ubuntu-latest, 24)	1m 12s
	4m 51s