termios: Fix type of tcgetattr and tcsetattr attributes (#4662)

Returning a union from tcgetattr forces the caller to use isinstance or
a type: ignore comment if they modify the returned list. Return
List[Any] instead.

The cc field has ints at cc[termios.VTIME] and cc[termios.VMIN] if
lflag & termios.ICANON is zero. Change _Attr to allow this.

Fixes #4661

stdlib/2and3/termios.pyi

@@ -1,7 +1,7 @@
 from _typeshed import FileDescriptorLike
-from typing import List, Union
+from typing import Any, List, Union
 
-_Attr = List[Union[int, List[bytes]]]
+_Attr = List[Union[int, List[Union[bytes, int]]]]
 
 # TODO constants not really documented
 B0: int
@@ -236,7 +236,7 @@ VWERASE: int
 XCASE: int
 XTABS: int
 
-def tcgetattr(fd: FileDescriptorLike) -> _Attr: ...
+def tcgetattr(fd: FileDescriptorLike) -> List[Any]: ...
 def tcsetattr(fd: FileDescriptorLike, when: int, attributes: _Attr) -> None: ...
 def tcsendbreak(fd: FileDescriptorLike, duration: int) -> None: ...
 def tcdrain(fd: FileDescriptorLike) -> None: ...