Update for pydantic v2

[adrianeboyd]

Description

Update for pydantic v2. This depends on:

• https://github.com/explosion/confection/pull/31
• https://github.com/explosion/weasel/pull/44

Types of change

Enhancement.

Checklist

• [x] I confirm that I have the right to submit this contribution under the project's MIT license.
• [x] I ran the test suite, and all new and existing tests passed.
• [x] My changes don't require a change to the documentation, or if they do, I've added all required information.

[adrianeboyd]

The correct/published lower pin for confection may need to be updated in the future.