Remove unused imports from the starlette extension (#846)

Author: rmk135

src/dependency_injector/ext/starlette.py

@@ -1,6 +1,5 @@
 import sys
-from abc import ABCMeta, abstractmethod
-from typing import Any, Callable, Coroutine, Optional
+from typing import Any
 
 if sys.version_info >= (3, 11):  # pragma: no cover
     from typing import Self