Update victron_mqtt to 2025.8.25 and merge topics (#98)

Co-authored-by: tomer-w <57483589+tomer-w@users.noreply.github.com>

Author: github-actions[bot]

custom_components/victron_mqtt/manifest.json

@@ -11,13 +11,13 @@
   "iot_class": "local_push",
   "issue_tracker": "https://github.com/tomer-w/ha-victron-mqtt/issues",
   "requirements": [
-    "victron_mqtt==2025.8.24"
+    "victron_mqtt==2025.8.25"
   ],
   "ssdp": [
     {
       "manufacturer": "Victron Energy",
       "X_MqttOnLan": "1"
     }
   ],
-  "version": "2025.8.20"
+  "version": "2025.8.21"
 }

victron_mqtt.json

@@ -1901,7 +1901,7 @@
       "message_type": "MetricKind.SENSOR",
       "short_id": "tank_remaining",
       "name": "Remaining",
-      "unit_of_measurement": "m3",
+      "unit_of_measurement": "m\u00b3",
       "metric_type": "MetricType.LIQUID_VOLUME",
       "metric_nature": "MetricNature.INSTANTANEOUS",
       "device_type": "Liquid Tank",