chore(deps): update to async-channel 2.0.0 #415

Job	Run time
Checking fmt and docs	53s
Clippy check	23s
Build and test (ubuntu-latest, nightly)	1m 38s
Build and test (ubuntu-latest, beta)	1m 43s
Build and test (ubuntu-latest, stable)	1m 31s
Build and test (windows-latest, nightly)	3m 34s
Build and test (windows-latest, beta)	2m 46s
Build and test (windows-latest, stable)	3m 1s
Build and test (macOS-latest, nightly)	2m 45s
Build and test (macOS-latest, beta)	2m 1s
Build and test (macOS-latest, stable)	2m 54s
	23m 9s

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