Bug#1005988: Don't release with bookworm

[Moritz Muehlenhoff]

Source: dpatch
Version: 2.0.41
Severity: serious

dpatch has been obsoleted by source format 3.0 (quilt), there's only
19 reverse dependencies in the archive (5 of them in testing), for
which bugs have been filed.

Cheers,
        Moritz