snapper: update to 0.13.0

[Swiddis]

In addition to the version update, two changes:

Fixed the snapperd service:

• Snapperd isn't a continuous daemon, it's short-lived and meant to run on a timescale near the backup interval (in the OpenSuse package it's on a 1 hour timer, afaict snapper doesn't support sub-hour backup intervals). The current service has an infinite rerun loop with snapperd, when it has nothing to do it waits 60s and exits. I updated the service to use snooze to run hourly.

Cleaned some build deps:

• libboost_thread: part of boost-devel-minimal as of at least 0a420a4
• e2fsprogs-devel: no longer a snapper dependency as of 0.12.2

Testing the changes

• I tested the changes in this PR: YES, snapshot browsing+creating+rollback

Local build testing

• I built this PR locally for my native architecture, x86_64-LIBC