bug#43893: [PATCH v2] maint: update-guix-package: Prevent accidentally breaking guix pull.

[Maxim Cournoyer]

Hello!

I went ahead and merged this with commit 5800d2aae2.  I think it
provides more benefits (breaking 'guix pull' is quite bad) than
drawbacks.

Thanks for your input!

Closing,

Maxim