Update to wgpu 0.20.1 #1401

Job	Run time
cargo clippy (windows-latest)	5m 38s
cargo check (msrv) (wasm32)	1m 16s
cargo check (aarch64-android)	1m 27s
cargo clippy (macos-latest)	3m 25s
cargo check (msrv) (windows-latest)	3m 24s
cargo clippy (ubuntu-latest)	3m 13s
cargo check (msrv) (macos-latest)	1m 46s
cargo check (msrv) (ubuntu-latest)	1m 30s
cargo clippy (wasm32)	2m 32s
cargo doc	1m 7s
cargo fmt	28s
cargo test (wasm32)	1m 20s
typos	13s
cargo test (windows-latest)	4m 23s
cargo test (macos-latest)	2m 5s
cargo test (ubuntu-latest)	3m 12s
	36m 59s

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