♻️ Remove Python 3.9 specific logic

fastapi/_compat/shared.py

@@ -21,9 +21,6 @@ from typing_extensions import TypeGuard, get_args, get_origin
 _T = TypeVar("_T")
 
 # Copy from Pydantic: pydantic/_internal/_typing_extra.py
-if sys.version_info < (3, 10):
-    WithArgsTypes: tuple[Any, ...] = (typing._GenericAlias, types.GenericAlias)  # type: ignore[attr-defined]
-else:
 WithArgsTypes: tuple[Any, ...] = (
     typing._GenericAlias,  # type: ignore[attr-defined]
     types.GenericAlias,

fastapi/dependencies/utils.py

@@ -199,7 +199,6 @@ def get_flat_params(dependant: Dependant) -> list[ModelField]:
 
 
 def _get_signature(call: Callable[..., Any]) -> inspect.Signature:
-    if sys.version_info >= (3, 10):
     try:
         signature = inspect.signature(call, eval_str=True)
     except NameError:
@@ -211,8 +210,6 @@ def _get_signature(call: Callable[..., Any]) -> inspect.Signature:
             signature = inspect.signature(call, annotation_format=Format.FORWARDREF)
         else:
             signature = inspect.signature(call)
-    else:
-        signature = inspect.signature(call)
     return signature