Use lowercase tuple where possible (#6170)

stdlib/asyncio/futures.pyi

@@ -1,6 +1,6 @@
 import sys
 from concurrent.futures._base import Error, Future as _ConcurrentFuture
-from typing import Any, Awaitable, Callable, Generator, Iterable, Tuple, TypeVar
+from typing import Any, Awaitable, Callable, Generator, Iterable, TypeVar
 
 from .events import AbstractEventLoop
 
@@ -38,7 +38,7 @@ class Future(Awaitable[_T], Iterable[_T]):
     def __del__(self) -> None: ...
     if sys.version_info >= (3, 7):
         def get_loop(self) -> AbstractEventLoop: ...
-        def _callbacks(self: _S) -> list[Tuple[Callable[[_S], Any], Context]]: ...
+        def _callbacks(self: _S) -> list[tuple[Callable[[_S], Any], Context]]: ...
         def add_done_callback(self: _S, __fn: Callable[[_S], Any], *, context: Context | None = ...) -> None: ...
     else:
         @property