[issue37781] Use "z" for PY_FORMAT_SIZE_T

[Inada Naoki]

Change by Inada Naoki <songofacandy at gmail.com>:


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keywords: +patch
pull_requests: +14890
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/15156

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37781>
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