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Update ActivitySim to use Pydantic version 2 for settings validation. There are small changes in the pydantic API to accommodate.
It should be a smidge faster, although settings validation is such a small part of overall runtime that it's likely not noticeable (unless we eventually use Pydantic for more). But more importantly, this is the most up-to-date version of Pydantic so compatibility with that tool and others that rely on it will be more robust.
This PR closes #795