Upgrade tox to v4

https://tox.wiki/en/4.5.1/upgrading.html Per tox-dev/tox#2429, this should also fix Windows build-system errors that are showing up in CI like this https://github.com/sjdemartini/graphene-django-permissions/actions/runs/4875516502/jobs/8697821652#step:5:7
sjdemartini · May 3, 2023 · e828ad5 · e828ad5
1 parent c439e32
commit e828ad5
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diff --git a/poetry.lock b/poetry.lock
diff --git a/pyproject.toml b/pyproject.toml
@@ -36,7 +36,7 @@ pytest = "^7.1.2"
 pytest-cov = "^3.0.0"
 pytest-django = "^4.5.2"
 ruff = "0.0.264"
-tox = "^3.25.0"
+tox = "^4.5.1"
 twine = "^4.0.0"
 pre-commit = "^2.19.0"
 toml = "^0.10.2"

diff --git a/setup.cfg b/setup.cfg
@@ -25,7 +25,6 @@ exclude_lines =
     def main
 
 [tox:tox]
-isolated_build = true
 envlist = py37, py38, py39, py310, py311, lint, format, build
 
 [gh-actions]