calls from other threads fallback for _winrt.py

[x-0D]

partially closes #65 , possibly causes ValueError: NULL COM pointer access when doing UI changes from other thread
(or my testing code just bad, IDK)

  File "[MASKED]\main.py", line 591, in __init__
    self._obj.Text = "img"
    ^^^^^^^^^^^^^^
  File "[MASKED]\.venv\Lib\site-packages\win32more\_winrt.py", line 695, in __call__
    interface_instance = instance.as_(hints["self"])
                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "[MASKED]\.venv\Lib\site-packages\win32more\_winrt.py", line 147, in ComPtr_as
    hr = self.QueryInterface(pointer(iid), pointer(instance))
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "[MASKED]\.venv\Lib\site-packages\win32more\__init__.py", line 458, in __call__
    return self._delegate(this, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "[MASKED]\.venv\Lib\site-packages\win32more\__init__.py", line 476, in __call__
    result = self._delegate(this, *cargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ValueError: NULL COM pointer access