Bump crossbeam-channel from 0.5.14 to 0.5.15 #8992

Job	Run time
build-linux-musl (nightly)	4m 45s
build (ubuntu-latest, nightly)	2m 34s
build (ubuntu-latest, 1.70)	2m 26s
build (ubuntu-latest, stable)	2m 26s
build-linux-musl (1.70)	3m 40s
build (macos-latest, nightly)	8m 8s
build-linux-arm (1.70)	6m 26s
build-linux-arm (stable)	6m 41s
build (macos-latest, stable)	5m 57s
build (macos-latest, 1.70)	3m 2s
build-linux-musl (stable)	4m 29s
Changelog Test	5s
Lints	39s
build-linux-arm (nightly)	18m 54s
build-apple-x86 (stable)	5m 27s
build-apple-x86 (1.70)	2m 9s
build-apple-x86 (nightly)	1m 58s
build (windows-latest, stable)	6m 54s
udeps	2m 18s
build (windows-latest, nightly)	24m 25s
build (windows-latest, 1.70)	24m 5s
	2h 17m 28s

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