Update victron_mqtt to 2026.3.12 (#328)

## Changes

- Fix couple of metric_natures

## Contributors

@tomer-w

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

Author: github-actions[bot]

custom_components/victron_mqtt/manifest.json

@@ -10,7 +10,7 @@
   "iot_class": "local_push",
   "issue_tracker": "https://github.com/tomer-w/ha-victron-mqtt/issues",
   "requirements": [
-    "victron_mqtt==2026.3.11"
+    "victron_mqtt==2026.3.12"
   ],
   "ssdp": [
     {

victron_mqtt.json

@@ -981,7 +981,7 @@
       "name": "Time since last full charge",
       "unit_of_measurement": "seconds",
       "metric_type": "MetricType.NONE",
-      "metric_nature": "MetricNature.TOTAL_INCREASING",
+      "metric_nature": "MetricNature.TOTAL",
       "value_type": "ValueType.FLOAT",
       "precision": null,
       "enum": null,
@@ -1003,7 +1003,7 @@
       "name": "Cumulative Ah drawn",
       "unit_of_measurement": "Ah",
       "metric_type": "MetricType.ELECTRIC_STORAGE_CAPACITY",
-      "metric_nature": "MetricNature.TOTAL_INCREASING",
+      "metric_nature": "MetricNature.TOTAL",
       "value_type": "ValueType.FLOAT",
       "precision": 1,
       "enum": null,