CI failing on macOS

[cole-h]

Hm, looks like this got auto-merged despite the macOS test failing:

 error: output '/nix/store/xy00jpkg9cgn5xpap8c26qiz44jifxaf-nix-2.10.0pre20220607_0f8754c' is not allowed to refer to the following paths:
         /nix/store/3l6v7v8c30g6zhipn15cpss86x43pgnh-boost-1.77.0

Originally posted by @edolstra in #6598 (comment)

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I don't know how to further debug this (sorry for introducing it 🙇), but maybe filing an issue will make it easier for people more knowledgeable in the ways of macOS to debug.

[cole-h]

Looks like this should be fixed by #6630.

[cole-h]

Fixed by #6630.