use _typeshed's Path aliases (#4214)

stdlib/3/configparser.pyi

@@ -1,15 +1,8 @@
-# Based on http://docs.python.org/3.5/library/configparser.html and on
-# reading configparser.py.
-
+from _typeshed import AnyPath, StrPath
 import sys
 from typing import (AbstractSet, MutableMapping, Mapping, Dict, Sequence, List,
                     Union, Iterable, Iterator, Callable, Any, IO, overload,
-                    Optional, Pattern, Type, TypeVar, ClassVar)
-# Types only used in type comments only
-from typing import Optional, Tuple  # noqa
-
-if sys.version_info >= (3, 6):
-    from os import PathLike
+                    Optional, Pattern, Type, TypeVar, ClassVar, Tuple)
 
 # Internal type aliases
 _section = Mapping[str, str]
@@ -19,11 +12,9 @@ _converters = Dict[str, _converter]
 _T = TypeVar('_T')
 
 if sys.version_info >= (3, 7):
-    _Path = Union[str, bytes, PathLike[str]]
-elif sys.version_info >= (3, 6):
-    _Path = Union[str, PathLike[str]]
+    _Path = AnyPath
 else:
-    _Path = str
+    _Path = StrPath
 
 DEFAULTSECT: str
 MAX_INTERPOLATION_DEPTH: int