add types to sys.getrefcount

Author: tharvik

stdlib/3/sys.pyi

@@ -122,7 +122,7 @@ def getcheckinterval() -> int: ...  # deprecated
 def getdefaultencoding() -> str: ...
 def getdlopenflags() -> int: ...  # Unix only
 def getfilesystemencoding() -> str: ...  # cannot return None
-def getrefcount(object) -> int: ...
+def getrefcount(object: Any) -> int: ...
 def getrecursionlimit() -> int: ...
 
 @overload