Unable to specify wheel version for building

[GrowlingM1ke]

Details

• Read the Docs project URL: https://readthedocs.org/projects/calcium-transient-analysis/
• Build URL : https://readthedocs.org/projects/calcium-transient-analysis/builds/26645248/
• Read the Docs username: https://readthedocs.org/profiles/GrowlingM1ke/

Expected Result

Successfully build with the correct version of wheel being used.

Actual Result

My builds have been recently failing due to a specific library I'm using (mayavi). I've managed to figure out how to get the build to run successfully locally however it still fails when it builds on readthedocs. I've noticed that even when specifying in pyproject.toml

[build-system]
requires = [
    "setuptools>=42",
    "wheel==0.45.1",
]

The output logs shows that it is using wheel version 0.40.0:

python -mvirtualenv $READTHEDOCS_VIRTUALENV_PATH
created virtual environment CPython3.10.15.final.0-64 in 667ms
  creator CPython3Posix(dest=/home/docs/checkouts/readthedocs.org/user_builds/calcium-transient-analysis/envs/latest, clear=False, no_vcs_ignore=False, global=False)
  seeder FromAppData(download=False, pip=bundle, setuptools=bundle, wheel=bundle, via=copy, app_data_dir=/home/docs/.local/share/virtualenv)
    added seed packages: pip==23.1, setuptools==67.6.1, wheel==0.40.0
  activators BashActivator,CShellActivator,FishActivator,NushellActivator,PowerShellActivator,PythonActivator

This confuses me because I thought it did recognize my pyproject.toml:

  Getting requirements to build wheel: started
  Getting requirements to build wheel: finished with status 'done'
  Preparing metadata (pyproject.toml): started
  Preparing metadata (pyproject.toml): finished with status 'done'

I'm not quite sure what the exact culprit is but my best guess is that it has to do something with wheel.