python3-importlib-metadata: upgrade 4.6.3 -> 4.6.4

v4.6.4
  Issue 334: Correct SimplePath protocol to match pathlib protocol
  for __truediv__.

References:
https://github.com/python/importlib_metadata/issues/334



Signed-off-by: Tim Orling <timothy.t.orling@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>