Fix update victron workflow

Author: tomer-w

.github/workflows/update_victron_mqtt.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v6
         with:
-          python-version: '3.11'
+          python-version: '3.14'
 
       - name: Get latest victron_mqtt release
         id: get_release