scripts/verify-bashisms: Update checkbashisms.pl URL

anonscm.debian.org is not used any more, update the URL.

Signed-off-by: Petr Vorel <petr.vorel@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 3c89071a)
Signed-off-by: Steve Sakoman <steve@sakoman.com>