Release upgrade to pydantic

[criemen]

Hey, we're using githubkit together with apache-airflow. The current apache-airflow version requires pydantic v2, but this package pulls in v1, resulting in a conflict.
Would it be possible to cut a new release that includes #45?
Thanks a lot in advance!

[yanyongyu]

Since #45 includes huge breaking changes and is not fully validated, i would like to create an alpha release before it can easily migrate to pydantic v2.

[yanyongyu]

Pydantic v2 support is now included in v0.11.0a0 pre-release.