Droping Python2 support for Biopython

[Andreas Tille <andreas@an3as.eu>]

Control: tags -1 pending

Hi,

I just removed Python2 support for Biopython in Git since I managed to
port the latest reverse dependencies requiring python-biopython
yesterday.  I'm hesitating to upload since Michael is discussing test
suite errors on arm64 with upstream.

I wonder whether we should upload anyway after excluding the test in
question and file a bug report about this to make sure it will not be
forgotten.  This bug report could also serve as a sensible place to
discuss that issue.

Kind regards

       Andreas.

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