fix and update alectryon #3947

Job	Run time
nix	2m 12s
quick-build (9.0, ubuntu-latest)	3m 10s
quick-build (dev, ubuntu-latest)	3m 23s
build (dev, --warnings)	3m 25s
build (9.1)	3m 18s
opam-build (9.0, ubuntu-latest)	4m 15s
build (9.0)	3m 19s
opam-build (9.1, ubuntu-latest)	4m 14s
opam-build (dev, ubuntu-latest)	4m 8s
quick-build (9.1, ubuntu-latest)	3m 21s
doc-alectryon	1m 29s
doc-dep-graphs	8m 14s
doc-coqdoc	1m 30s
doc-timing	1m 34s
install (9.0)	1m 39s
coqchk (9.0)	1m 56s
install (dev)	1m 42s
coqchk (dev)	1m 55s
install (9.1)	1m 31s
coqchk (9.1)	1m 49s
delete-artifacts	7s
deploy-doc	0s
	58m 11s

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