walk: Use unbounded channels #1066

Job	Run time
Ensure 'cargo fmt' has been run	9s
Extract crate metadata	3s
Minimum supported rust version	2m 33s
aarch64-unknown-linux-gnu (ubuntu-20.04)	4m 29s
arm-unknown-linux-gnueabihf (ubuntu-20.04)	7m 3s
arm-unknown-linux-musleabihf (ubuntu-20.04)	5m 7s
i686-pc-windows-msvc (windows-2019)	9m 31s
i686-unknown-linux-gnu (ubuntu-20.04)	6m 45s
i686-unknown-linux-musl (ubuntu-20.04)	4m 51s
x86_64-apple-darwin (macos-12)	3m 50s
x86_64-pc-windows-gnu (windows-2019)	5m 8s
x86_64-pc-windows-msvc (windows-2019)	7m 11s
x86_64-unknown-linux-gnu (ubuntu-20.04)	6m 14s
x86_64-unknown-linux-musl (ubuntu-20.04)	8m 22s
Publish to Winget	0s
	1h 11m 16s

Provide feedback