Clean up files with former forced consistency (#4717)

Replace Text with str in Python 3 code

stdlib/3/unittest/mock.pyi

@@ -1,5 +1,5 @@
 import sys
-from typing import Any, Callable, Generic, List, Mapping, Optional, Sequence, Text, Tuple, Type, TypeVar, Union, overload
+from typing import Any, Callable, Generic, List, Mapping, Optional, Sequence, Tuple, Type, TypeVar, Union, overload
 
 _F = TypeVar("_F", bound=Callable[..., Any])
 _T = TypeVar("_T")
@@ -252,7 +252,7 @@ class _patcher:
     def object(  # type: ignore
         self,
         target: Any,
-        attribute: Text,
+        attribute: str,
         *,
         spec: Optional[Any] = ...,
         create: bool = ...,
@@ -265,7 +265,7 @@ class _patcher:
     def object(
         self,
         target: Any,
-        attribute: Text,
+        attribute: str,
         new: _T = ...,
         spec: Optional[Any] = ...,
         create: bool = ...,