Bump tox from 3.22.0 to 3.23.0 (#147)

dependabot-preview[bot] · web-flow · commit b9349902ed47 · 2021-03-22T09:29:00.000Z
diff --git a/requirements_test.txt b/requirements_test.txt
@@ -1,6 +1,6 @@
 coverage==5.5
 flake8==3.9.0
-tox==3.22.0
+tox==3.23.0
 codecov==2.1.11
 pytest==6.1.2
 pytest-django==4.1.0
