walk: Use unbounded channels #1063

Job	Run time
Ensure 'cargo fmt' has been run	14s
Extract crate metadata	6s
Minimum supported rust version	2m 1s
aarch64-unknown-linux-gnu (ubuntu-20.04)	4m 39s
arm-unknown-linux-gnueabihf (ubuntu-20.04)	4m 35s
arm-unknown-linux-musleabihf (ubuntu-20.04)	4m 17s
i686-pc-windows-msvc (windows-2019)	8m 44s
i686-unknown-linux-gnu (ubuntu-20.04)	4m 10s
i686-unknown-linux-musl (ubuntu-20.04)	3m 23s
x86_64-apple-darwin (macos-12)	4m 55s
x86_64-pc-windows-gnu (windows-2019)	6m 9s
x86_64-pc-windows-msvc (windows-2019)	8m 28s
x86_64-unknown-linux-gnu (ubuntu-20.04)	7m 35s
x86_64-unknown-linux-musl (ubuntu-20.04)	7m 1s
Publish to Winget	0s
	1h 6m 17s

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