Update to wgpu 0.20 (#4560) #57

Job	Run time
Check wasm32 + wasm-bindgen	3m 11s
Format + check + test	12m 48s
cargo-deny aarch64-apple-darwin	40s
cargo-deny aarch64-linux-android	43s
android	57s
Check Windows	3m 35s
cargo-deny i686-pc-windows-gnu	47s
cargo-deny i686-pc-windows-msvc	43s
cargo-deny i686-unknown-linux-gnu	44s
cargo-deny wasm32-unknown-unknown	42s
cargo-deny x86_64-apple-darwin	44s
cargo-deny x86_64-pc-windows-gnu	45s
cargo-deny x86_64-pc-windows-msvc	47s
cargo-deny x86_64-unknown-linux-gnu	39s
cargo-deny x86_64-unknown-linux-musl	41s
cargo-deny x86_64-unknown-redox	41s
	29m 7s

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