avoid deprecated old sbt syntax #1939

Job	Run time
build (2_12, mima)	1m 55s
conformance	2m 48s
build (2_12, e2e)	9s
build (2_12, test)	13m 45s
build (2_13, mima)	1m 56s
build (2_13, e2e)	7s
build (2_13, test)	16m 18s
build (3, mima)	5s
build (3, e2e)	7s
build (3, test)	10m 44s
build (2_12, examples_and_formatting)	3m 52s
build (2_13, scala3_compat_test)	9m 8s
build (3, scala3_compat_test)	14m 7s
ci-passed	1s
	1h 15m 2s

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