Move basepython completely out. This should make this work with tox-uv.

Author: ionelmc

tox.ini

@@ -20,8 +20,6 @@ envlist =
 ignore_basepython_conflict = true
 
 [testenv]
-basepython =
-    {bootstrap,clean,check,report,docs,codecov}: {env:TOXPYTHON:python3}
 setenv =
     PYTHONPATH={toxinidir}/tests
     PYTHONUNBUFFERED=yes
@@ -80,6 +78,7 @@ commands =
     {posargs:python setup.py clean --all build_ext --force}
 
 [testenv:docs]
+basepython = {env:TOXPYTHON:python3.13}
 usedevelop = true
 deps =
     -r{toxinidir}/docs/requirements.txt
@@ -88,6 +87,7 @@ commands =
     sphinx-build -b linkcheck docs dist/docs
 
 [testenv:report]
+basepython = {env:TOXPYTHON:python3.13}
 deps =
     coverage
     cython
@@ -99,6 +99,7 @@ commands =
     coverage html
 
 [testenv:clean]
+basepython = {env:TOXPYTHON:python3.13}
 commands =
     python setup.py clean
     coverage erase