Fix issue https://github.com/deepmind/meltingpot/issues/34 where we use the wrong import for bot policy typing annotations.
Fix issue https://github.com/deepmind/meltingpot/issues/34 where we use the wrong import for bot policy typing annotations.

PiperOrigin-RevId: 453181401
Change-Id: Ie3c30d6cb2375700ff65ca0dba29ccf8811555be

deepmind/meltingpot,deepmind/meltingpot