marshmallow 4.0.0 compatibility - marshmallow.__version__ missing in 4.0.0

[joeld1]

Describe the bug
marshmallow no longer contains __version__ attribute.

    if name == "__version__":
        warnings.warn(
            "The '__version__' attribute is deprecated and will be removed in"
            " in a future version. Use feature detection or"
            " 'importlib.metadata.version(\"marshmallow\")' instead.",
            DeprecationWarning,
            stacklevel=2,
        )
        return importlib.metadata.version("marshmallow")

To Reproduce
accompany uplink installation with marshmallow 4.0.0 pinned

Expected behavior
no import errors should occur because of marshmallow.__version__