Enforce modern Python typing annotations with Ruff (#8296)

Co-authored-by: openhands <openhands@all-hands.dev>

openhands/utils/async_utils.py

@@ -1,7 +1,7 @@
 import asyncio
 from concurrent import futures
 from concurrent.futures import ThreadPoolExecutor
-from typing import Callable, Coroutine, Iterable, List
+from typing import Callable, Coroutine, Iterable
 
 GENERAL_TIMEOUT: int = 15
 EXECUTOR = ThreadPoolExecutor()
@@ -64,7 +64,7 @@ async def call_coro_in_bg_thread(
 
 async def wait_all(
     iterable: Iterable[Coroutine], timeout: int = GENERAL_TIMEOUT
-) -> List:
+) -> list:
     """
     Shorthand for waiting for all the coroutines in the iterable given in parallel. Creates
     a task for each coroutine.

openhands/utils/import_utils.py

@@ -1,6 +1,6 @@
 import importlib
 from functools import lru_cache
-from typing import Type, TypeVar
+from typing import TypeVar
 
 T = TypeVar('T')
 
@@ -15,7 +15,7 @@ def import_from(qual_name: str):
 
 
 @lru_cache()
-def get_impl(cls: Type[T], impl_name: str | None) -> Type[T]:
+def get_impl(cls: type[T], impl_name: str | None) -> type[T]:
     """Import a named implementation of the specified class"""
     if impl_name is None:
         return cls