Make the macOS regex allow `macosx` #406

Job	Run time
Alpine Linux	2m 27s
FreeBSD-x86_64 with rust stable	1m 21s
Linux-x86_64 with rust stable	1m 17s
Linux-x86_64 (rustls-native-roots) with rust stable	1m 9s
Linux-x86_64 (native-tls) with rust stable	1m 30s
Linux-x86_64 (native-tls-vendored) with rust stable	2m 22s
Linux-aarch64 with rust stable	1m 14s
Linux-arm with rust stable	1m 2s
Linux-i686 with rust stable	43s
Linux-powerpc with rust stable	1m 4s
Linux-powerpc64 with rust stable	51s
Linux-powerpc64le with rust stable	37s
Linux-riscv64 with rust stable	53s
Linux-s390x with rust stable	41s
NetBSD-x86_64 with rust stable	1m 54s
Windows-aarch64 with rust stable	2m 16s
Windows-i686 with rust stable	3m 42s
Windows-x86_64 with rust stable	3m 3s
macOS-x86_64 with rust stable	1m 37s
macOS-aarch64 with rust stable	1m 16s
Linux-x86_64 with rust beta	1m 10s
Linux-x86_64 with rust nightly	1m 31s
	33m 40s

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