ray: [Ray Core] failed to serialize namedtuple in py3.9

What happened + What you expected to happen

ray failed to serialize namedtuple in py3.9, which looks like a error from cloudpickle: https://github.com/cloudpipe/cloudpickle/issues/460

Versions / Dependencies

python 3.9.7 ray 1.13.0

not tested with other versions

Reproduction script

from typing import NamedTuple
import ray
ray.init()

class T(NamedTuple):
    a:str
    
@ray.remote
def test():
    return T('a')

ray.get(test.remote())

Traceback (most recent call last):
  File "/home/auderson/miniconda3/envs/py3.9/lib/python3.9/site-packages/IPython/core/interactiveshell.py", line 3361, in run_code
    exec(code_obj, self.user_global_ns, self.user_ns)
  File "<ipython-input-7-7f1d37acd5e0>", line 1, in <cell line: 1>
    ray.get(test.remote())
  File "/home/auderson/miniconda3/envs/py3.9/lib/python3.9/site-packages/ray/_private/client_mode_hook.py", line 105, in wrapper
    return func(*args, **kwargs)
  File "/home/auderson/miniconda3/envs/py3.9/lib/python3.9/site-packages/ray/worker.py", line 1831, in get
    raise value.as_instanceof_cause()
ray.exceptions.RayTaskError(RuntimeError): ray::test() (pid=353630, ip=...)
RuntimeError: The remote function failed to import on the worker. This may be because needed library dependencies are not installed in the worker environment:
ray::test() (pid=353630, ip=...)
  File "/home/auderson/miniconda3/envs/py3.9/lib/python3.9/site-packages/ray/cloudpickle/cloudpickle.py", line 872, in _make_skeleton_class
    skeleton_class = types.new_class(
  File "/home/auderson/miniconda3/envs/py3.9/lib/python3.9/types.py", line 77, in new_class
    return meta(name, resolved_bases, ns, **kwds)
  File "/home/auderson/miniconda3/envs/py3.9/lib/python3.9/typing.py", line 1852, in __new__
    module=ns['__module__'])
KeyError: '__module__'

ray.util.inspect_serializability(T)

================================================
Checking Serializability of <class '__main__.T'>
================================================
Out[9]: (True, set())

Issue Severity

Low: It annoys or frustrates me.