Update wgpu requirement from 0.19.3 to 0.20.0 #41424

Job	Run time
build (windows-latest)	1m 25s
check-bevy-internal-imports	5s
check-cfg	1m 41s
build (ubuntu-latest)	1m 39s
check-doc	2m 21s
build (macos-latest)	1m 23s
check-missing-examples-in-docs	35s
ci	2m 35s
miri	6m 43s
run-examples-macos-metal	1m 18s
toml	2m 12s
typos	8s
check-missing-features-in-docs	1m 19s
build-wasm-atomics	0s
msrv	0s
build-wasm	0s
markdownlint	1m 9s
check-compiles	0s
	24m 33s

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