Fix pydantic and autodoc_pydantic version to <2.0.0 until support it added.

[loadams]

• pydantic is working on updating to a 2.0.0 that is not backwards compatible, we will need to add this, but since this will break our CI when it is released, this is a preventative step.
• autodoc_pydantic hasn't addressed how they will handle this, though it will be tracked in this issue. I assume they will update to 2.0.0 once they add support as well.
• Once pydantic 2.0.0 is released, fixes will be added in #3289.