[issue20728] Remove unused import from base64

[Roundup Robot]

Roundup Robot added the comment:

New changeset d3732760e3d6 by Terry Jan Reedy in branch 'default':
Closes issue #20728: Remove unused import added in rev 42366e293b7b and
http://hg.python.org/cpython/rev/d3732760e3d6

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nosy: +python-dev

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