bump delete-artifact #2882

Job	Run time
nix	2m 7s
build (supported)	3m 21s
quick-build (supported, ubuntu-latest)	3m 12s
build (latest)	3m 13s
opam-build (supported, ubuntu-latest)	4m 46s
quick-build (latest, ubuntu-latest)	3m 13s
build (dev, --warnings)	3m 18s
opam-build (latest, ubuntu-latest)	4m 34s
quick-build (dev, ubuntu-latest)	3m 4s
opam-build (dev, ubuntu-latest)	4m 26s
doc-alectryon	14m 47s
doc-timing	1m 30s
coqchk (supported)	2m 4s
doc-coqdoc	1m 27s
doc-dep-graphs	7m 10s
coqchk (latest)	2m 2s
install (supported)	1m 32s
coqchk (dev)	1m 52s
install (latest)	1m 33s
install (dev)	1m 46s
deploy-doc	0s
delete-artifacts	8s
	1h 11m 5s

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