sysutils/restic: update to 0.13.1

ChangeLog: https://github.com/restic/restic/releases/tag/v0.13.1

• Fix the diff command
• Fix rclone (shimmed by Scoop) and sftp stopped working on Windows

Rported by: portsctout
MFH: 2022Q2 (bugfix release)

(cherry picked from commit 6177f0d01edba0b733c06c8467dcc55d78995f49)