bug#38907: Recursive crates importer does not respect dependencies versions

[Valentin Ignatev]

Hey Guix! I'm trying to import notify 4.0.14 with guix import crate
notify@4.0.14 --recursive and it completes without an error, but it
doesn't seem to pick correct versions for dependencies.

For example, notify v4.0.14 deends on fsevent ^0.4, but the crates
importer generates a definition for fsevent v2.0.1. Attached file is
the result of guix import crate notify@4.0.14 --recursive command

Best regards,
Valentin

notify.scm
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