macOS

Bump crossbeam-channel in /gc/mmtk in the cargo group across 1 directory #615

Job	Run time
make (check, macos-14)	6m 47s
make (check, macos-14, --with-gmp)	6m 21s
make (check, macos-14, --with-gcc=gcc-14)	7m 28s
make (test-bundler-parallel, macos-14)	21m 41s
make (test-bundled-gems, macos-14)	10m 1s
make (test-all, --repeat-count=2, macos-14)	10m 26s
make (check, macos-15)	4m 57s
make (check, macos-13)	11m 42s
make (check, macos-14, --with-jemalloc --with-opt-dir=$(brew --prefix jemalloc))	6m 14s
macOS result	4s
	1h 25m 41s

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