Fix issues related to tox4

Related to https://lists.openstack.org/pipermail/openstack-discuss/2023-February/032247.html

Change-Id: I52cfda7d2010c750609dd97033ba95ecea6b774c

tox.ini

@@ -1,11 +1,9 @@
 [tox]
 minversion = 3.2.0
 envlist = py3,pep8
-ignore_basepython_conflict = True
 
 [testenv]
-basepython = python3
-whitelist_externals =
+allowlist_externals =
   find
 deps =
   -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
@@ -32,7 +30,7 @@ commands =
 commands = {posargs}
 
 [testenv:docs]
-whitelist_externals = rm
+allowlist_externals = rm
 deps =
   -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
   -r{toxinidir}/doc/requirements.txt
@@ -59,7 +57,7 @@ exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build
 import_exceptions =
 
 [testenv:releasenotes]
-whitelist_externals =
+allowlist_externals =
   rm
 deps = {[testenv:docs]deps}
 commands =