Update mdoc to 2.5.4 #1550

Job	Run time
examples (ubuntu-latest)	2m 39s
integration-tests (ubuntu-22.04)	28m 54s
format	24s
bincompat	3m 10s
integration-tests (macos-12)	37m 42s
integration-tests (windows-latest)	22m 48s
publishLocal	16m 29s
examples (windows-latest)	4m 32s
test (ubuntu-latest, 8, 2.12.18)	2m 36s
website	1m 10s
test (ubuntu-latest, 8, 2.12.19)	2m 25s
test (ubuntu-latest, 8, 2.13.13)	2m 45s
test (ubuntu-latest, 8, 2.13.14)	2m 23s
test (ubuntu-latest, 8, 3.3.3)	2m 29s
test (ubuntu-latest, 8, 3.4.2)	2m 25s
test (windows-latest, 8, 2.13.14)	3m 4s
test (macos-12, 8, 2.13.14)	3m 6s
test (ubuntu-latest, 17, 2.13.14)	2m 39s
all-tests	1s
	2h 21m 41s

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