Update dependency tox to v4

renovate[bot] · web-flow · commit 8176a5235fa4 · 2022-12-18T18:49:10.000Z
diff --git a/requirements_dev.txt b/requirements_dev.txt
@@ -3,6 +3,6 @@ coverage==6.4
 pip==22.1.1
 pytest==7.1.2
 Sphinx==5.0.2
-tox==3.25.0
+tox==4.0.12
 twine==4.0.0
 wheel==0.37.1
