github754: make this test work again #2928

Job	Run time
nix	2m 4s
quick-build (supported, ubuntu-latest)	3m 14s
build (supported)	3m 28s
quick-build (latest, ubuntu-latest)	3m 12s
opam-build (supported, ubuntu-latest)	5m 6s
build (latest)	3m 16s
quick-build (dev, ubuntu-latest)	3m 14s
build (dev, --warnings)	3m 14s
opam-build (latest, ubuntu-latest)	4m 52s
opam-build (dev, ubuntu-latest)	4m 35s
doc-coqdoc	1m 38s
doc-alectryon	15m 16s
coqchk (supported)	2m 2s
coqchk (latest)	1m 54s
doc-timing	1m 33s
doc-dep-graphs	7m 14s
coqchk (dev)	1m 51s
install (supported)	1m 41s
install (latest)	1m 45s
install (dev)	1m 34s
deploy-doc	0s
delete-artifacts	6s
	1h 12m 49s

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