pip install mercurial is broken on Windows CI

[straight-shoota]

https://github.com/crystal-lang/shards/actions/runs/10661704235/job/29547633885

Run pip install mercurial
  pip install mercurial
  shell: C:\Program Files\PowerShell\7\pwsh.EXE -command ". '{0}'"
Collecting mercurial
  Downloading mercurial-6.8.1.tar.gz (8.3 MB)
     ---------------------------------------- 8.3/8.3 MB 74.0 MB/s eta 0:00:00
  Installing build dependencies: started
  Installing build dependencies: finished with status 'done'
  Getting requirements to build wheel: started
  Getting requirements to build wheel: finished with status 'error'
  error: subprocess-exited-with-error
  
  Getting requirements to build wheel did not run successfully.
  exit code: 1
  
  [17 lines of output]
  Traceback (most recent call last):
    File "C:\hostedtoolcache\windows\Python\3.9.13\x64\lib\site-packages\pip\_vendor\pyproject_hooks\_in_process\_in_process.py", line 353, in <module>
      main()
    File "C:\hostedtoolcache\windows\Python\3.9.13\x64\lib\site-packages\pip\_vendor\pyproject_hooks\_in_process\_in_process.py", line 335, in main
      json_out['return_val'] = hook(**hook_input['kwargs'])
    File "C:\hostedtoolcache\windows\Python\3.9.13\x64\lib\site-packages\pip\_vendor\pyproject_hooks\_in_process\_in_process.py", line 118, in get_requires_for_build_wheel
      return hook(config_settings)
    File "C:\Users\runneradmin\AppData\Local\Temp\pip-build-env-f47lhb64\overlay\Lib\site-packages\setuptools\build_meta.py", line 332, in get_requires_for_build_wheel
      return self._get_build_requires(config_settings, requirements=[])
    File "C:\Users\runneradmin\AppData\Local\Temp\pip-build-env-f47lhb64\overlay\Lib\site-packages\setuptools\build_meta.py", line 302, in _get_build_requires
      self.run_setup()
    File "C:\Users\runneradmin\AppData\Local\Temp\pip-build-env-f47lhb64\overlay\Lib\site-packages\setuptools\build_meta.py", line 503, in run_setup
      super().run_setup(setup_script=setup_script)
    File "C:\Users\runneradmin\AppData\Local\Temp\pip-build-env-f47lhb64\overlay\Lib\site-packages\setuptools\build_meta.py", line 318, in run_setup
      exec(code, locals())
    File "<string>", line 1665, in <module>
  ImportError: cannot import name 'msvccompiler' from 'distutils' (C:\Users\runneradmin\AppData\Local\Temp\pip-build-env-f47lhb64\overlay\Lib\site-packages\setuptools\_distutils\__init__.py)
  [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
error: subprocess-exited-with-error

Getting requirements to build wheel did not run successfully.
exit code: 1

See above for output.

note: This error originates from a subprocess, and is likely not a problem with pip.
Error: Process completed with exit code 1.

The error reproduces with pip install mercurial on my local machine, so it's not specific to the CI environment.

[straight-shoota]

So apparently the distutils package has been deprecated since Python 3.10 (https://docs.python.org/3.10/whatsnew/3.10.html#distutils-deprecated). It was eventually removed in 3.12.
But mercurial depends on this package, so it fails to install. There is an upstream issue about this: https://bz.mercurial-scm.org/show_bug.cgi?id=6910 But so far mercurial seems to be unusalbe with Python 3.12+.

I tried pinning the Python version to 3.9 but it still fails for the same reason: https://github.com/crystal-lang/shards/actions/runs/11201431779/job/31136340697. I have no idea why.

Until we get this working again, I suppose we should disable mercurial tests on Windows or find a different way to install a working mercurial.