sysutils/backuppc4: Update to 4.1.3

While here, removing `-[0-9]*` from CONFLICTS

Changes: https://github.com/backuppc/backuppc/releases/tag/4.1.3

PR:	219816
Submitted by:	Alexander Moisseev <moiseev@mezonplus.ru> (maintainer)
Approved by:	garga (mentor)
Differential Revision:	https://reviews.freebsd.org/D11079

$ portlint -C
WARN: Makefile: possible use of absolute pathname "/var/db/BackupPC".
WARN: Conflict "backuppc" specified too broad. You should end it with a version number fragment (-[0-9]*).
WARN: Conflict "backuppc-devel" specified too broad. You should end it with a version number fragment (-[0-9]*).
0 fatal errors and 3 warnings found.