### Body

Currently Pydantic 2.0.0 released on 30th of June 2023 breaks Airflow CI - building providers and running Kubernetes tests.

Therefore we limit Pydantic to < 2.0.0 in setup.cfg for now.

This should be fixed, especially that 2.0.0 brings a number of speed improvements.


### Committer

- [X] I acknowledge that I am a maintainer/committer of the Apache Airflow project.
#
#
from datetime import datetime
from typing import List, Optional
from pendulum import DateTime
from pydantic import BaseModel as BaseModelPydantic
from airflow.serialization.pydantic.dataset import DatasetEventPydantic
class DagRunPydantic(BaseModelPydantic):