fix: Role Edit TypeHint (#2795)

Signed-off-by: Lumouille <[email protected]>

Author: Lumabots

discord/role.py

@@ -458,7 +458,7 @@ async def edit(
         reason: str | None = MISSING,
         icon: bytes | None = MISSING,
         unicode_emoji: str | None = MISSING,
-    ) -> Role | None:
+    ) -> Role:
         """|coro|
 
         Edits the role.