Enable `clippy::cast_possible_wrap`. #613

Job	Run time
miri	1m 55s
deny	43s
incremental-mutants	0s
build (ubuntu, stable, locked, true)	22m 15s
no_std	42s
build (windows, stable, locked, false)	24m 48s
build (macos, stable, locked, false)	12m 27s
build (ubuntu, nightly, locked, false)	22m 1s
build (ubuntu, beta, locked, false)	13m 5s
build (ubuntu, stable, latest, false)	13m 44s
build (ubuntu, stable, minimal, false)	13m 35s
deploy	7s
features	27m 57s
fuzz	15m 35s
	2h 48m 54s

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