Streamline tox.ini

tox.ini

@@ -1,22 +1,22 @@
 [tox]
-envlist =
+min_version = 4
+env_list =
     pre-commit,
     mypy,
     py37,
     py38,
-    py39,py39-colorama,
+    py39{,-colorama},
     py310,
-    py311,py311-{be,rich},
+    py311{,-be,-rich},
     docs,
     coverage-report
-isolated_build = true
 
 
 [testenv:docs]
 # Keep basepython in sync with ci.yml/docs and .readthedocs.yaml.
-basepython = python3.10
+base_python = python3.10
 extras = docs
-passenv = TERM
+pass_env = TERM
 commands =
     sphinx-build -n -T -W -b html -d {envtmpdir}/doctrees docs docs/_build/html
     sphinx-build -n -T -W -b doctest -d {envtmpdir}/doctrees docs docs/_build/html
@@ -36,7 +36,7 @@ commands = mypy src typing_examples.py
 
 [testenv]
 extras = tests
-setenv = PYTHONHASHSEED = 0
+set_env = PYTHONHASHSEED = 0
 commands = python -m pytest {posargs}
 
 
@@ -67,7 +67,7 @@ basepython = python3.11
 deps = coverage[toml]
 skip_install = true
 parallel_show_output = true
-depends = py37,py39-colorama,py311,py311-{be,rich}
+depends = py37,py39-colorama,py311{,-be,-rich}
 commands =
     python -m coverage combine
     python -m coverage report