Bump to v0.51.4 release-version

Author: bouwew

custom_components/plugwise/manifest.json

@@ -9,5 +9,5 @@
   "iot_class": "local_polling",
   "loggers": ["plugwise"],
   "requirements": ["plugwise==0.38.3"],
-  "version": "0.51.3"
+  "version": "0.51.4"
 }