Update scalafmt-core to 3.7.12 #1834

Job	Run time
conformance	2m 35s
build (2_12, mima)	1m 49s
build (2_12, e2e)	3m 35s
build (2_12, proptest)	3m 37s
build (2_13, mima)	2m 5s
build (2_13, e2e)	3m 37s
build (2_13, proptest)	3m 36s
build (3, mima)	8s
build (3, e2e)	3m 35s
build (3, proptest)	3m 35s
build (2_12, examples_and_formatting)	2m 56s
ci-passed	0s
	31m 8s

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