Fixed annotation style for return - mypy

outlines/fsm/json_schema.py

@@ -2,7 +2,7 @@
 import json
 import re
 import warnings
-from typing import Callable, Optional
+from typing import Callable, Optional, Tuple
 
 from jsonschema.protocols import Validator
 from pydantic import create_model
@@ -98,7 +98,7 @@ def _get_num_items_pattern(min_items, max_items, whitespace_pattern):
 
 def validate_quantifiers(
     min_bound: Optional[str], max_bound: Optional[str], start_offset: int = 0
-) -> (str, str):
+) -> Tuple[str, str]:
     """
     Ensures that the bounds of a number are valid. Bounds are used as quantifiers in the regex.