Do not require typing_extensions on Python 3.11

19878a5 added an unconditional
dependency on typing_extensions to fix tests with Python 3.10 3.11.
This commit fixes this issue by only requiring typing_extensions on
Python versions lower than 3.11 and using standard typing on Python 3.11
and newer.

(cherry picked from commit 8581d9d)

Author: paper42

ChangeLog

@@ -16,6 +16,8 @@ Release date: TBA
 
   Closes #1958
 
+* Remove unnecessary typing_extensions dependency on Python 3.11 and newer
+
 What's New in astroid 2.13.2?
 =============================
 Release date: 2023-01-08

pyproject.toml

@@ -36,7 +36,7 @@ dependencies = [
     "wrapt>=1.14,<2;python_version>='3.11'",
     "wrapt>=1.11,<2;python_version<'3.11'",
     "typed-ast>=1.4.0,<2.0;implementation_name=='cpython' and python_version<'3.8'",
-    "typing-extensions>=4.0.0",
+    "typing-extensions>=4.0.0;python_version<'3.11'",
 ]
 dynamic = ["version"]
 

tests/unittest_scoped_nodes.py

@@ -1907,11 +1907,14 @@ def test_mro_typing_extensions(self):
         import typing
         import dataclasses
 
-        import typing_extensions
+        if sys.version_info >= (3, 8):
+            from typing import Protocol
+        else:
+            from typing_extensions import Protocol
 
         T = typing.TypeVar("T")
 
-        class MyProtocol(typing_extensions.Protocol): pass
+        class MyProtocol(Protocol): pass
         class EarlyBase(typing.Generic[T], MyProtocol): pass
         class Base(EarlyBase[T], abc.ABC): pass
         class Final(Base[object]): pass