Revert "Init smile_version with version-string"

This reverts commit c0c224b.

Author: bouwew

plugwise/__init__.py

@@ -80,7 +80,7 @@ def __init__(
         self.smile_model_id: str | None = None
         self.smile_name: str = NONE
         self.smile_type: str = NONE
-        self.smile_version: Version = Version("0.0.0")
+        self.smile_version: Version | None = None
         self.smile_zigbee_mac_address: str | None = None
 
     @property