Enable --disallow-any-generics for stubs (#3288)

stdlib/2/mutex.pyi

@@ -1,13 +1,12 @@
 # Source: https://hg.python.org/cpython/file/2.7/Lib/mutex.py
 
-from collections import deque
-from typing import Any, Callable, TypeVar
+from typing import Any, Callable, Deque, TypeVar
 
 _ArgType = TypeVar('_ArgType')
 
 class mutex:
     locked: bool
-    queue: deque
+    queue: Deque[Any]
     def __init__(self) -> None: ...
     def test(self) -> bool: ...
     def testandset(self) -> bool: ...