Fix using deprecated virtualenv option --wheel

[robsdedude]

The CI started failing when virtualenv deprecated the --wheel and --no-wheel options (in 20.31.0). This PR makes it so that tox doesn't run into this deprecation which caused the tests to fail that checked for some expected stdout which were then unexpectedly containing the deprecation message.

• ran the linter to address style issues (tox -e fix)
• wrote descriptive pull request text
• ensured there are test(s) validating the fix
  (Existing test were failing, so if this improves the situation, I consider this box ticked 😉)
• added news fragment in docs/changelog folder not user-facing, or it it?
• updated/extended the documentation API/CLI didn't change

[robsdedude]

This turns out to be more involved than I anticipated it to be 😇

I think to be able to get rid of using virtualenv to install wheel, pyproject-api needs to be update to not require wheel. Which would be in line with the pyproject.toml specs:

[build-system]
# Minimum requirements for the build system to execute.
requires = ["setuptools"]

Build tools are expected to use the example configuration file above as their default semantics when a pyproject.toml file is not present.

I think it might be this line that's causing issues: https://github.com/tox-dev/pyproject-api/blob/46dc443b1a33599fb76f869bd911fd4827eafb0d/src/pyproject_api/_frontend.py#L179

[gaborbernat]

This turns out to be more involved than I anticipated it to be 😇

I think to be able to get rid of using virtualenv to install wheel, pyproject-api needs to be update to not require wheel. Which would be in line with the pyproject.toml specs:

[build-system]
# Minimum requirements for the build system to execute.
requires = ["setuptools"]

Build tools are expected to use the example configuration file above as their default semantics when a pyproject.toml file is not present.

I think it might be this line that's causing issues: tox-dev/pyproject-api@46dc443/src/pyproject_api/_frontend.py#L179

You're correct here.

[gaborbernat]

https://github.com/tox-dev/pyproject-api/releases/tag/1.9.1

[hroncok]

With pyproject-api 1.9.1, this works and fixes the issue for me.