Correct the type comment of update_dict_to_dotenv

Author: mrjng

src/dotenv/main.py

@@ -369,7 +369,7 @@ def dotenv_values(
 
 
 def update_dict_to_dotenv(dotenv_path, env_dict, quote_mode="always", export=False):
-    # type: (_PathLike, Dict[Text, Optional[Text]], Text, bool) -> None
+    # type: (_PathLike, Dict[Text, Text], Text, bool) -> None
     """
     Adds or Updates key/value pairs in the given dictionary to the given .env