[BUG] EnumTransformer throws TypeError with Python 3.11

[linhai-fn]

Describe the bug

EnumTransformer throws the following error when using Python 3.11:

File /fn/lib/python3.11/enum.py:742, in EnumType.__contains__(cls, member)
    735     import warnings
    736     warnings.warn(
    737             "in 3.12 __contains__ will no longer raise TypeError, but will return True or\n"
    738             "False depending on whether the value is a member or the value of a member",
    739             DeprecationWarning,
    740             stacklevel=2,
    741             )
--> 742     raise TypeError(
    743         "unsupported operand type(s) for 'in': '%s' and '%s'" % (
    744             type(member).__qualname__, cls.__class__.__qualname__))
    745 return isinstance(member, cls) and member._name_ in cls._member_map_

TypeError: unsupported operand type(s) for 'in': 'str' and 'EnumType'

The reason is due to these two lines in the assert_type:

...
val = v.value if isinstance(v, enum.Enum) else v
if val not in t:
...

The following code returns True in python 3.12. But will throw an TypeError in python 3.11 as described above.

from enum import Enum

class TestEnum(Enum):
    TEST = "Test"

TestEnum.TEST.value in TestEnum

Expected behavior

EnumTransformer shouldn't throw a TypeError when checking if a value is a member of an Enum.

Additional context to reproduce

No response

Screenshots

No response

Are you sure this issue hasn't been raised already?

• Yes

Have you read the Code of Conduct?

• Yes