Downgrade pydantic in dev env

[DevonFulcher]

Description

This PR makes type-checking more consistent for local development. I have had an annoying issue with the type-checker reporting errors that weren't appearing in CI. Initially, I thought this was a problem with mypy, but actually the problem was that I have been using Pydantic 2, but the types in the codebase are only compatible with Pydantic 1. Specifically, I was getting a lot of errors for properties like extra_detail that don't have a default value:

class ValidationIssue(ABC, BaseModel):
    """The abstract base ValidationIssue class that the specific ValidationIssue classes are built from."""

    message: str
    context: Optional[ValidationContext] = None
    extra_detail: Optional[str]

Checklist

• I have read the contributing guide and understand what's expected of me
• I have signed the CLA
• This PR includes tests, or tests are not required/relevant for this PR
• I have run changie new to create a changelog entry

[courtneyholcomb]

Hmmm I wonder if we should also restrict this in prod? Why only change dev?

[DevonFulcher]

This is a problem only with mypy and the type annotations. This problem doesn't impact the production release version.