Vendored typing-extensions is incompatible with Python 3.12

[blink1073]

Description

We tried testing against the new Python 3.12 beta-1 release in Jupyter Server, and ran into the following bug when running pip debug:

ERROR: Exception:
Traceback (most recent call last):
  File "/opt/hostedtoolcache/Python/3.12.0-beta.1/x64/lib/python3.12/site-packages/pip/_internal/cli/base_command.py", line 169, in exc_logging_wrapper
    status = run_func(*args)
             ^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.12.0-beta.1/x64/lib/python3.12/site-packages/pip/_internal/commands/debug.py", line 195, in run
    show_vendor_versions()
  File "/opt/hostedtoolcache/Python/3.12.0-beta.1/x64/lib/python3.12/site-packages/pip/_internal/commands/debug.py", line 101, in show_vendor_versions
    show_actual_vendor_versions(vendor_txt_versions)
  File "/opt/hostedtoolcache/Python/3.12.0-beta.1/x64/lib/python3.12/site-packages/pip/_internal/commands/debug.py", line 81, in show_actual_vendor_versions
    actual_version = get_vendor_version_from_module(module_name)
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.12.0-beta.1/x64/lib/python3.12/site-packages/pip/_internal/commands/debug.py", line 61, in get_vendor_version_from_module
    module = get_module_from_module_name(module_name)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.12.0-beta.1/x64/lib/python3.12/site-packages/pip/_internal/commands/debug.py", line 56, in get_module_from_module_name
    __import__(f"pip._vendor.{module_name}", globals(), locals(), level=0)
  File "/opt/hostedtoolcache/Python/3.12.0-beta.1/x64/lib/python3.12/site-packages/pip/_vendor/typing_extensions.py", line 1174, in <module>
    class TypeVar(typing.TypeVar, _DefaultMixin, _root=True):
TypeError: type 'typing.TypeVar' is not an acceptable base type

It looks like the vendored typing_extensions needs to be updated to 4.6.0 to pick up python/typing_extensions#162

Expected behavior

pip debug works on Python 3.12 beta-1

pip version

23.1.2

Python version

3.12.0b1

OS

Ubuntu 22.04.2

How to Reproduce

1. Install packages using pip 23.1.2 on Python 3.12.0b1
2. Run pip list

Output

$ pip debug
WARNING: This command is only meant for debugging. Do not use this with automation for parsing and getting these details, since the output and options of this command may change without notice.
pip version: pip 23.1.2 from /opt/hostedtoolcache/Python/3.12.0-beta.1/x64/lib/python3.12/site-packages/pip (python 3.12)
sys.version: 3.12.0b1 (main, May 25 2023, 06:32:07) [GCC 11.3.0]
sys.executable: /opt/hostedtoolcache/Python/3.12.0-beta.1/x64/bin/python
sys.getdefaultencoding: utf-8
sys.getfilesystemencoding: utf-8
locale.getpreferredencoding: [UTF-8](https://jira.mongodb.org/browse/UTF-8)
sys.platform: linux
sys.implementation:
  name: cpython
'cert' config value: global
REQUESTS_CA_BUNDLE: None
CURL_CA_BUNDLE: None
pip._vendor.certifi.where(): /opt/hostedtoolcache/Python/3.12.0-beta.1/x64/lib/python3.12/site-packages/pip/_vendor/certifi/cacert.pem
pip._vendor.DEBUNDLED: False
vendored library versions:
  CacheControl==0.12.11
  colorama==0.4.6
  distlib==0.3.6
  distro==1.8.0
  msgpack==1.0.5
  packaging==21.3
  platformdirs==3.2.0
  pyparsing==3.0.9
  pyproject-hooks==1.0.0
  requests==2.28.2
  certifi==2022.12.07
  chardet==5.1.0
  idna==3.4
  urllib3==1.26.15
  rich==13.3.3 (Unable to locate actual module version, using vendor.txt specified version)
  pygments==2.14.0
ERROR: Exception:
Traceback (most recent call last):
  File "/opt/hostedtoolcache/Python/3.12.0-beta.1/x64/lib/python3.12/site-packages/pip/_internal/cli/base_command.py", line 169, in exc_logging_wrapper
    status = run_func(*args)
             ^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.12.0-beta.1/x64/lib/python3.12/site-packages/pip/_internal/commands/debug.py", line 195, in run
    show_vendor_versions()
  File "/opt/hostedtoolcache/Python/3.12.0-beta.1/x64/lib/python3.12/site-packages/pip/_internal/commands/debug.py", line 101, in show_vendor_versions
    show_actual_vendor_versions(vendor_txt_versions)
  File "/opt/hostedtoolcache/Python/3.12.0-beta.1/x64/lib/python3.12/site-packages/pip/_internal/commands/debug.py", line 81, in show_actual_vendor_versions
    actual_version = get_vendor_version_from_module(module_name)
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.12.0-beta.1/x64/lib/python3.12/site-packages/pip/_internal/commands/debug.py", line 61, in get_vendor_version_from_module
    module = get_module_from_module_name(module_name)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.12.0-beta.1/x64/lib/python3.12/site-packages/pip/_internal/commands/debug.py", line 56, in get_module_from_module_name
    __import__(f"pip._vendor.{module_name}", globals(), locals(), level=0)
  File "/opt/hostedtoolcache/Python/3.12.0-beta.1/x64/lib/python3.12/site-packages/pip/_vendor/typing_extensions.py", line 1174, in <module>
    class TypeVar(typing.TypeVar, _DefaultMixin, _root=True):
TypeError: type 'typing.TypeVar' is not an acceptable base type

Code of Conduct

• I agree to follow the PSF Code of Conduct.

[uranusjr]

A pull request to update the vendored package would be welcomed. Instructions can be found in the documentation.