Fix title component assignment

Author: Jackenmen

red_githubbot/discord_webhook.py

@@ -225,7 +225,7 @@ def _update_title_component(self) -> None:
             self._title_component.content = ""
             return
         text = f"[{self._title}]({self._url})" if self._url else self._title
-        self._title_component = f"### {text}"
+        self._title_component.content = f"### {text}"
 
     @property
     def title(self) -> str: