TypeError: ['python', '-m', 'build'] is not of type 'str' in macos

[martibosch]

Issue

I am getting a TypeError: ['python', '-m', 'build'] is not of type 'str' in macos when running tox in github actions for macos-latest. Here is the pyproject.toml used. I am following the pyproject-toml-native sections of the docs.

Full environments and logs: https://github.com/martibosch/detectree/actions/runs/12182400694/job/33981322086

Martí