Log Message:
py-pydantic-core: update to 2.27.0.

What's Changed

    Remove Url and MultiHostUrl docstrings, we moved them to pydantic by \ 
@sydney-runkle in #1531
    Fix panic in validate_assignment when field has gone missing by @davidhewitt \ 
in #1532
    Fix for Union serializer: do not raise warnings in nested unions by \ 
@lukapeschke in #1513
    Fix _IncEx type alias to be compatible with mypy by @Viicos in #1537
    More union serialization tidying by @sydney-runkle in #1536
    Fix wrap serializer breaking union serialization in presence of extra fields \ 
by @davidhewitt in #1530
    Support trailing-strings with allow_partial by @samuelcolvin in #1539