Update `once_cell` dependency to 1.18.0. #197

Job	Run time
miri	2m 20s
no_std	1m 1s
build (ubuntu, stable, locked, true)	1h 13m 33s
build (windows, stable, locked, false)	45m 21s
build (macos, stable, locked, false)	25m 2s
build (ubuntu, nightly, locked, false)	35m 43s
build (ubuntu, beta, locked, false)	22m 54s
build (ubuntu, stable, latest, false)	33m 34s
build (ubuntu, stable, minimal, false)	2m 42s
deploy	5s
fuzz	17m 48s
	4h 20m 3s

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