[issue25349] Use _PyBytesWriter for bytes%args

[Roundup Robot]

Roundup Robot added the comment:

New changeset 090502a0c69c by Victor Stinner in branch 'default':
Issue #25349, #26249: Fix memleak in formatfloat()
https://hg.python.org/cpython/rev/090502a0c69c

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25349>
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