[3.11] gh-104018: disallow "z" format specifier in %-format of byte strings (GH-104033) #104058
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PEP-0682 specified that %-formatting would not support the "z" specifier,
but it was unintentionally allowed for bytes. This PR makes use of the "z"
flag an error for %-formatting in a bytestring.
Issue: GH-104018
(cherry picked from commit 3ed8c88)
Co-authored-by: John Belmonte john@neggie.net
Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>