[issue39509] Update HTTP status code to follow IANA

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

RFC 8297: https://tools.ietf.org/html/rfc8297
RFC 8470: https://tools.ietf.org/html/rfc8470

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<https://bugs.python.org/issue39509>
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