fix fix-machos when signing fails #359

Job	Run time
build (ubuntu-latest, linux, x86-64)	33s
unavailable	22s
build (macos-latest, darwin, aarch64)	32s
id	2m 15s
bottle (xz, darwin+aarch64)	15s
test (darwin+aarch64)	27s
audit (ubuntu-latest)	26s
test	24s
bottle (gz, linux+x86-64)	24s
bottle (xz, linux+x86-64)	20s
audit (macos-latest)	25s
bottle (gz, darwin+aarch64)	21s
	6m 44s

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