fixup: nitpicks Python code fixed using ruff

Author: autoruff

plugwise/util.py

@@ -216,7 +216,7 @@ def format_measure(measure: str, unit: str) -> float | int:
 def get_vendor_name(module: etree, model_data: ModuleData) -> ModuleData:
     """Helper-function for _get_model_data()."""
     if (vendor_name := module.find("vendor_name").text) is not None:
-        model_data["vendor_name"] = vendor_name.decode('utf-8')
+        model_data["vendor_name"] = vendor_name.decode("utf-8")
         if "Plugwise" in vendor_name:
             model_data["vendor_name"] = vendor_name.split(" ", 1)[0]