Fix using deprecated virtualenv option --wheel

Author: robsdedude

pyproject.toml

@@ -60,7 +60,7 @@ dependencies = [
   "pyproject-api>=1.8",
   "tomli>=2.2.1; python_version<'3.11'",
   "typing-extensions>=4.12.2; python_version<'3.11'",
-  "virtualenv>=20.29.1",
+  "virtualenv>=20.31",
 ]
 optional-dependencies.test = [
   "devpi-process>=1.0.2",

src/tox/pytest.py

@@ -281,7 +281,8 @@ def our_setup_state(value: Sequence[str]) -> State:
                 m.setenv("VIRTUALENV_SYMLINK_APP_DATA", "1")
                 m.setenv("VIRTUALENV_SYMLINKS", "1")
                 m.setenv("VIRTUALENV_PIP", "embed")
-                m.setenv("VIRTUALENV_WHEEL", "embed")
+                if sys.version_info[:2] < (3, 9):
+                    m.setenv("VIRTUALENV_WHEEL", "embed")
                 m.setenv("VIRTUALENV_SETUPTOOLS", "embed")
                 try:
                     tox_run(args)