modify Type annotation

Author: okue

linebot/models/messages.py

@@ -74,7 +74,7 @@ def __init__(self, id=None, content_provider=None, **kwargs):
         :param str id: Message ID
         :param content_provider: ContentProvider object
         :type content_provider:
-            Union[:py:class:`linebot.models.messages.ContentProvider`, Dict[str, str]]
+            :py:class:`linebot.models.messages.ContentProvider` | dict[str, str]
         :param kwargs:
         """
         super(ImageMessage, self).__init__(id=id, **kwargs)
@@ -101,7 +101,7 @@ def __init__(self, id=None, duration=None, content_provider=None, **kwargs):
         :param long duration: Length of video file (milliseconds)
         :param content_provider: ContentProvider object
         :type content_provider:
-            Union[:py:class:`linebot.models.messages.ContentProvider`, Dict[str, str]]
+            :py:class:`linebot.models.messages.ContentProvider` | dict[str, str]
         :param kwargs:
         """
         super(VideoMessage, self).__init__(id=id, **kwargs)
@@ -129,7 +129,7 @@ def __init__(self, id=None, duration=None, content_provider=None, **kwargs):
         :param long duration: Length of audio file (milliseconds)
         :param content_provider: ContentProvider object
         :type content_provider:
-            Union[:py:class:`linebot.models.messages.ContentProvider`, Dict[str, str]]
+            :py:class:`linebot.models.messages.ContentProvider` | dict[str, str]
         :param kwargs:
         """
         super(AudioMessage, self).__init__(id=id, **kwargs)