fix and update alectryon #3954

Job	Run time
nix	2m 11s
build (dev, --warnings)	3m 43s
quick-build (9.1, ubuntu-latest)	3m 38s
quick-build (9.0, ubuntu-latest)	3m 14s
opam-build (dev, ubuntu-latest)	4m 10s
opam-build (9.0, ubuntu-latest)	4m 16s
build (9.1)	3m 21s
quick-build (dev, ubuntu-latest)	3m 16s
opam-build (9.1, ubuntu-latest)	4m 14s
build (9.0)	3m 8s
doc-dep-graphs	7m 45s
doc-alectryon	1m 43s
doc-coqdoc	1m 41s
doc-timing	1m 43s
install (dev)	1m 51s
install (9.1)	1m 43s
install (9.0)	1m 41s
coqchk (9.1)	1m 48s
coqchk (9.0)	1m 53s
coqchk (dev)	1m 54s
deploy-doc	0s
delete-artifacts	7s
	59m 0s

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