Fix failing Windows documentation build

[cooperlees]

Describe the bug

CI of building black documentation on Windows fails.

• It seems we're not installing black correctly in the doc build environment:

Running Sphinx v7.2.6

Configuration error:
There is a programmable error in your configuration file:

Traceback (most recent call last):
  File "C:\hostedtoolcache\windows\Python\3.12.0\x64\Lib\site-packages\sphinx\config.py", line 358, in eval_config_file
    exec(code, namespace)  # NoQA: S102
    ^^^^^^^^^^^^^^^^^^^^^
  File "D:\a\black\black\docs\conf.py", line 46, in <module>
    release = get_distribution("black").version.split("+")[0]
              ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\hostedtoolcache\windows\Python\3.12.0\x64\Lib\site-packages\pkg_resources\__init__.py", line 528, in get_distribution
    dist = get_provider(dist)
           ^^^^^^^^^^^^^^^^^^
  File "C:\hostedtoolcache\windows\Python\3.12.0\x64\Lib\site-packages\pkg_resources\__init__.py", line 400, in get_provider
    return working_set.find(moduleOrReq) or require(str(moduleOrReq))[0]
                                            ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\hostedtoolcache\windows\Python\3.12.0\x64\Lib\site-packages\pkg_resources\__init__.py", line 968, in require
    needed = self.resolve(parse_requirements(requirements))
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\hostedtoolcache\windows\Python\3.12.0\x64\Lib\site-packages\pkg_resources\__init__.py", line 829, in resolve
    dist = self._resolve_dist(
           ^^^^^^^^^^^^^^^^^^^
  File "C:\hostedtoolcache\windows\Python\3.12.0\x64\Lib\site-packages\pkg_resources\__init__.py", line 870, in _resolve_dist
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'black' distribution was not found and is required by the application

To Reproduce

Trigger CI

• Example run: https://github.com/psf/black/actions/runs/6616766174/job/17971681450

Expected behavior

We build the docs on Windows.

[JelleZijlstra]

The GitHub gods fixed it for us. (Or maybe we fixed it by reverting to 3.11 for some CI stuff?)