Bug#1131765: Block python-csb43 >= 1.0.0 from migrating to testing

[Mathias Behrle]

Control: severity -1 important

Downgrading severity to prevent auto-removal of the current package in testing.

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    Mathias Behrle
    PGP/GnuPG key availabable from any keyserver, ID: 0xD6D09BE48405BBF6
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