Raise poetry-core version cap to 2.1.3

[V02460]

Request to raise the defensive version cap for poetry-core from 1.9.1 to 2.1.3.

My understanding is that the major version bump of poetry signals the transition to standardized pyproject.toml metadata, but does not affect backwards compatibility.

This is a subset of the changes in #18432

Fixes #18200

Pull Request Checklist

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