Use lowercase type everywhere (#6853)

stdlib/doctest.pyi

@@ -1,6 +1,6 @@
 import types
 import unittest
-from typing import Any, Callable, NamedTuple, Type
+from typing import Any, Callable, NamedTuple
 
 class TestResults(NamedTuple):
     failed: int
@@ -86,7 +86,7 @@ class DocTestFinder:
     ) -> list[DocTest]: ...
 
 _Out = Callable[[str], Any]
-_ExcInfo = tuple[Type[BaseException], BaseException, types.TracebackType]
+_ExcInfo = tuple[type[BaseException], BaseException, types.TracebackType]
 
 class DocTestRunner:
     DIVIDER: str