Update dependency tox to v4

mend-for-proxy.laosky.tk[bot] · web-flow · commit 2f81c7decec5 · 2023-06-05T19:27:07.000Z
diff --git a/requirements.txt b/requirements.txt
@@ -2,7 +2,7 @@ autopep8==1.6.0
 pytest==7.1.2
 pytest-cov==3.0.0
 coverage==6.4.1
-tox==3.24.5
+tox==4.6.0
 pylint==2.14.5
 behave==1.2.5
 requests==2.28.0
