Deps does not honour specified versions other than ^x.y.z

Repro:

- Include an npm-package with a version that is *not* formatted like `^x.y.z`, e.g. `>=x.y.z`
- Include package in a custom group & run `deps install `
- result: package version is overwritten in package.json with `^x.y.z`

Expected:
- result: package version is still `>=x.y.z` in package.json.

Reproduce the issue with an npm package using a version such as >=x.y.z, place it in a custom group, and run deps install . Trace how the command updates package.json; done means the original version specifier remains unchanged instead of being replaced with ^x.y.z.

Written by the indexing model from the issue text.