Update to wgpu 0.20 #11008

Job	Run time
android	56s
cargo-deny aarch64-apple-darwin	42s
cargo-deny aarch64-linux-android	45s
cargo-deny i686-pc-windows-gnu	43s
cargo-deny i686-pc-windows-msvc	44s
cargo-deny i686-unknown-linux-gnu	41s
cargo-deny wasm32-unknown-unknown	40s
cargo-deny x86_64-apple-darwin	42s
cargo-deny x86_64-pc-windows-gnu	43s
cargo-deny x86_64-pc-windows-msvc	42s
cargo-deny x86_64-unknown-linux-gnu	41s
cargo-deny x86_64-unknown-linux-musl	40s
Check wasm32 + wasm-bindgen	1m 36s
cargo-deny x86_64-unknown-redox	42s
Format + check + test	9m 35s
Check Windows	4m 26s
	24m 58s

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