Update `wgpu` dep to 0.19.0. #374

Job	Run time
no_std	34s
incremental-mutants	44s
build (ubuntu, stable, locked, true)	13m 9s
miri	1m 43s
build (windows, stable, locked, false)	31m 20s
build (macos, stable, locked, false)	30m 41s
build (ubuntu, nightly, locked, false)	5m 15s
build (ubuntu, beta, locked, false)	21m 45s
build (ubuntu, stable, latest, false)	21m 2s
build (ubuntu, stable, minimal, false)	21m 35s
features	26m 50s
fuzz	15m 23s
deploy	0s
	3h 10m 1s

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