chore: bump THIS_VERSION to v712.23

Cuts the release carrying the upstream v8.49.0 merge (#46) and the annual
battery-cycles fix (#47). Merging those alone publishes nothing - release.yml
derives the tag from THIS_VERSION, so without this bump the workflow re-runs
against the existing v712.22 tag, finds it already published and exits.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: claude

apps/predbat/predbat.py

@@ -35,7 +35,7 @@
 import pytz
 import asyncio
 
-THIS_VERSION = "v712.22"
+THIS_VERSION = "v712.23"
 
 # Restart Predbat if a component stays unhealthy for this long
 COMPONENT_ERROR_RESTART_MINUTES = 10