Fix duplicate imports in type stubs

ubelt/util_cache.pyi

@@ -3,7 +3,6 @@ from typing import Callable
 from typing import Any
 from _typeshed import Incomplete
 from collections.abc import Generator
-from typing import Any
 
 
 class Cacher:

ubelt/util_func.pyi

@@ -2,7 +2,6 @@ from typing import Any
 from typing import Callable
 from typing import Dict
 from typing import Iterable
-from typing import Any
 
 
 def identity(arg: Any | None = None, *args, **kwargs) -> Any:

ubelt/util_futures.pyi

@@ -5,10 +5,8 @@ import concurrent.futures
 from typing import Callable
 from typing import Any
 from typing import List
-import concurrent.futures
 from _typeshed import Incomplete
 from collections.abc import Generator
-from typing import Any
 
 
 class SerialFuture(concurrent.futures.Future):

ubelt/util_indexable.pyi

@@ -4,7 +4,6 @@ from typing import Any
 from typing import Dict
 from _typeshed import Incomplete
 from collections.abc import Generator
-from typing import Any
 
 
 class IndexableWalker(Generator):

ubelt/util_stream.pyi

@@ -1,7 +1,6 @@
 import io
 from typing import Type
 from types import TracebackType
-import io
 from _typeshed import Incomplete