Fix #901 by correcting type hints for files_upload method args

Author: seratch

slack_sdk/web/async_client.py

@@ -1549,7 +1549,7 @@ async def files_sharedPublicURL(self, *, file: str, **kwargs) -> AsyncSlackRespo
         return await self.api_call("files.sharedPublicURL", json=kwargs)
 
     async def files_upload(
-        self, *, file: Union[str, IOBase] = None, content: str = None, **kwargs
+        self, *, file: Union[str, bytes, IOBase] = None, content: str = None, **kwargs
     ) -> AsyncSlackResponse:
         """Uploads or creates a file.
 

slack_sdk/web/client.py

@@ -1456,7 +1456,7 @@ def files_sharedPublicURL(self, *, file: str, **kwargs) -> SlackResponse:
         return self.api_call("files.sharedPublicURL", json=kwargs)
 
     def files_upload(
-        self, *, file: Union[str, IOBase] = None, content: str = None, **kwargs
+        self, *, file: Union[str, bytes, IOBase] = None, content: str = None, **kwargs
     ) -> SlackResponse:
         """Uploads or creates a file.
 

slack_sdk/web/legacy_client.py

@@ -1549,7 +1549,7 @@ def files_sharedPublicURL(
         return self.api_call("files.sharedPublicURL", json=kwargs)
 
     def files_upload(
-        self, *, file: Union[str, IOBase] = None, content: str = None, **kwargs
+        self, *, file: Union[str, bytes, IOBase] = None, content: str = None, **kwargs
     ) -> Union[Future, SlackResponse]:
         """Uploads or creates a file.