python3-six was an obsolete python2+3 transition layer,
that package is slowly being removed from Debian.

Please remove this one line from "branca" packaging:

Greetings

We believe that the bug you reported is fixed in the latest version of
branca, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1064603@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Georges Khaznadar <georgesk@debian.org> (supplier of updated branca package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Mon, 26 Feb 2024 12:17:09 +0100
Source: branca
Architecture: source
Version: 0.7.1-2
Distribution: unstable
Urgency: medium
Maintainer: Georges Khaznadar <georgesk@debian.org>
Changed-By: Georges Khaznadar <georgesk@debian.org>
Closes: 1064603
Changes:
 branca (0.7.1-2) unstable; urgency=medium
 .
   * removed the build-dependency on python3-six. Closes: #1064603
Checksums-Sha1:
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 1ba553bcee9731ffdcd29f4ffb311d7327b5cebb 2524 branca_0.7.1-2.debian.tar.xz
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Checksums-Sha256:
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Files:
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 8b2c68e0a0ca37cf06a36f4a5aa13e7b 2524 libdevel optional branca_0.7.1-2.debian.tar.xz
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