chore(deps): update to async-channel 2.0.0 #413

Job	Run time
Checking fmt and docs	55s
Clippy check	41s
Build and test (ubuntu-latest, nightly)	1m 35s
Build and test (ubuntu-latest, beta)	1m 54s
Build and test (ubuntu-latest, stable)	1m 28s
Build and test (windows-latest, nightly)	3m 13s
Build and test (windows-latest, beta)	3m 54s
Build and test (windows-latest, stable)	4m 7s
Build and test (macOS-latest, nightly)	1m 30s
Build and test (macOS-latest, beta)	1m 44s
Build and test (macOS-latest, stable)	2m 8s
	23m 9s

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