What happened + What you expected to happen

Currently, Ray's cloudpickle cannot serialize Pydantic dataclasses in Pydantic 1.10.x. However, it can serialize them in Pydantic 1.9.2.

Ray's cloudpickle logic should be updated to successfully serialize Pydantic dataclasses. This test should succeed.

Versions / Dependencies

Ray on the latest master. Pydantic 1.10.x.

Reproduction script

See test_serialize_serve_dataclass.

Issue Severity

High: It blocks me from completing my task.