chore(internal): use typing_extensions.overload instead of typing (…

…#667)

src/anthropic/resources/beta/prompt_caching/messages.py

@@ -2,9 +2,9 @@
 
 from __future__ import annotations
 
-from typing import List, Union, Iterable, overload
+from typing import List, Union, Iterable
 from functools import partial
-from typing_extensions import Literal
+from typing_extensions import Literal, overload
 
 import httpx
 

src/anthropic/resources/completions.py

@@ -2,8 +2,8 @@
 
 from __future__ import annotations
 
-from typing import List, overload
-from typing_extensions import Literal
+from typing import List
+from typing_extensions import Literal, overload
 
 import httpx
 

src/anthropic/resources/messages.py

@@ -3,9 +3,9 @@
 from __future__ import annotations
 
 import warnings
-from typing import List, Union, Iterable, overload
+from typing import List, Union, Iterable
 from functools import partial
-from typing_extensions import Literal
+from typing_extensions import Literal, overload
 
 import httpx