Update sbt to 1.9.6 #1875

Job	Run time
conformance	2m 27s
build (2_12, mima)	1m 45s
build (2_12, e2e)	5m 26s
build (2_12, proptest)	11m 2s
build (2_13, mima)	1m 46s
build (2_13, e2e)	5m 25s
build (2_13, proptest)	14m 23s
build (3, mima)	10s
build (3, e2e)	6m 31s
build (3, proptest)	12m 22s
build (2_12, examples_and_formatting)	3m 42s
ci-passed	1s
	1h 5m 0s

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