[py] Add instance check

Author: cgoldberg

py/selenium/webdriver/edge/service.py

@@ -63,6 +63,6 @@ def service_args(self) -> Sequence[str]:
 
     @service_args.setter
     def service_args(self, value: Sequence[str]):
-        if not isinstance(value, Sequence):
+        if not isinstance(value, Sequence) or isinstance(value, str):
             raise TypeError("service_args must be a sequence")
         self._service_args = value