Update sbt-mdoc to 2.5.0 (#1606) #1951

Job	Run time
build (2_12, mima)	1m 19s
conformance	2m 38s
build (2_12, e2e)	9s
build (2_12, test)	16m 25s
build (2_13, mima)	1m 25s
build (2_13, e2e)	5s
build (2_13, test)	10m 42s
build (3, mima)	4s
build (3, e2e)	6s
build (3, test)	7m 22s
build (2_12, examples_and_formatting)	4m 37s
build (2_13, scala3_compat_test)	12m 10s
build (3, scala3_compat_test)	8m 39s
ci-passed	1s
	1h 5m 42s

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