fix: add missing type hint

Author: jorwoods

tableauserverclient/models/reference_item.py

@@ -8,7 +8,7 @@ def __str__(self):
 
     __repr__ = __str__
 
-    def __eq__(self, other: object):
+    def __eq__(self, other: object) -> bool:
         if not hasattr(other, "id") or not hasattr(other, "tag_name"):
             return False
         return (self.id == other.id) and (self.tag_name == other.tag_name)