Have the `poetry show --outdated` result reflected in its exit code for automation/CI

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Feature Request

Poetry has an excellent way of showing packages which are outdated, but are either required to be outdated (as dependencies), or just plain outdated.

For example, here we have poetry installed, which depends on requests, which in turn depends on an outdated idna. We also have an outdated version of docker installed:

I'd like to be able to distinguish in a CI job if there are any packages outdated that can be updated, by result of a non zero exit code from running poetry show --outdated. This should then have a zero exit code when dependencies need to stay outdated.

This would be very useful in keeping things up to date, without having to do any manual work, and having a CI job keep watch on that for me.

Start by tracing the poetry show --outdated command and its current exit-code handling, then inspect the related CLI tests. The change is complete when the command returns a nonzero exit code for outdated packages that can be updated, but zero when packages are outdated only because of dependency constraints.