chore: migrate to tox 4.x

tox-wheel is a deprecated package. tox 4.x includes wheel support.

Author: bringhurst

.github/workflows/testing.yml

@@ -36,7 +36,7 @@ jobs:
       - name: Install required dependencies
         run: |
           python3 -m pip install --upgrade pip
-          pip install tox tox-wheel
+          pip install tox
 
       - name: Code check
         run: tox -e ${TOX_VENV}

tox.ini

@@ -1,15 +1,15 @@
 [tox]
-minversion = 3.24.1
+minversion = 4.3.4
 requires=
     virtualenv>=20.7.2
-    tox-wheel>=0.6.0
 skip_missing_interpreters=True
 envlist =
     pep8,black,
     gevent,eventlet,sasl,
     docs,
     pypy3
 isolated_build = true
+allowlist_externals={toxinidir}
 
 [testenv]
 wheel = True