Update sbt-mdoc to 2.4.0 (#1594) #1926

Job	Run time
build (2_12, mima)	1m 49s
conformance	2m 18s
build (2_12, e2e)	5s
build (2_12, test)	13m 27s
build (2_13, mima)	1m 46s
build (2_13, e2e)	6s
build (2_13, test)	12m 22s
build (3, mima)	8s
build (3, e2e)	6s
build (3, test)	13m 49s
build (2_12, examples_and_formatting)	5m 28s
build (2_13, scala3_compat_test)	10m 46s
build (3, scala3_compat_test)	13m 2s
ci-passed	1s
	1h 15m 13s

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