fix: resolve ruff lint errors (Dict -> dict, remove outdated version block)

fastapi/dependencies/utils.py

@@ -286,7 +286,7 @@ def get_typed_annotation(annotation: Any, globalns: dict[str, Any]) -> Any:
     return annotation
 
 
-def _try_resolve_annotated_string(annotation_str: str, globalns: Dict[str, Any]) -> Any:
+def _try_resolve_annotated_string(annotation_str: str, globalns: dict[str, Any]) -> Any:
     """
     Try to partially resolve an Annotated string annotation.
 

tests/test_annotated_forward_ref.py

@@ -2,15 +2,8 @@
 
 from __future__ import annotations
 
-import sys
 from dataclasses import dataclass
-
-# Annotated is available in typing from Python 3.9+
-# For Python 3.8, we need to import from typing_extensions
-if sys.version_info >= (3, 9):
-    from typing import Annotated
-else:
-    from typing import Annotated
+from typing import Annotated
 
 from fastapi import Depends, FastAPI
 from fastapi.testclient import TestClient