macOS

Bump crossbeam-channel from 0.5.13 to 0.5.15 in /gc/mmtk in the cargo group across 1 directory #616

Job	Run time
make (check, macos-14)	5m 46s
make (check, macos-14, --with-jemalloc --with-opt-dir=$(brew --prefix jemalloc))	5m 42s
make (check, macos-14, --with-gcc=gcc-14)	6m 40s
make (check, macos-14, --with-gmp)	6m 39s
make (test-bundled-gems, macos-14)	8m 45s
make (test-all, --repeat-count=2, macos-14)	8m 41s
make (check, macos-13)	10m 53s
make (check, macos-15)	5m 10s
make (test-bundler-parallel, macos-14)	19m 23s
macOS result	4s
	1h 17m 43s

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