Skip the upload (twig, 2.6.2-1) that already happened in 2001.

 twig   | 2.6.2-1 | 2001-02-25 20:15:31+00 | Jordi Mallach <jordi@debian.org> | Jordi Mallach   | jordi@debian.org | Jordi Mallach <jordi@debian.org> | Jordi Mallach   | jordi@debian.org | f   | Jordi Mallach <jordi@sindominio.net> | Jordi Mallach  | jordi@sindominio.net | 258494BA917A225E | unstable     | debian-devel-changes.200102 | 73ED4244FD43588620AC2644258494BA917A225E

But there is a new upload now, made on 2018-01-16, making the pkey
conflicting.

Closes: #922546
Signed-off-by: Mattia Rizzolo <mattia@debian.org>