Consolidate on @platforms//os:macos #5070
Merged
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Noticed because we have a new dep on @platforms//os:macos in https://github.com/carbon-language/carbon-lang/blob/trunk/toolchain/base/BUILD#L131
macos is preferred according to the definition at https://github.com/bazelbuild/platforms/blob/dd28c190c563531c06ba3bd64eca1cc9ca3e667f/os/BUILD#L70C1-L74C2