Fix issues related to tox4

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

Change-Id: Icf10da4f425ca3ea514eac132f7527165afe31a2

tox.ini

@@ -1,10 +1,8 @@
 [tox]
 minversion = 3.2.0
 envlist = py3,pep8,bandit
-ignore_basepython_conflict = true
 
 [testenv]
-basepython = python3
 setenv =
     VIRTUAL_ENV={envdir}
     BRANCH_NAME=master
@@ -14,7 +12,7 @@ deps =
   -r{toxinidir}/doc/requirements.txt
   -r{toxinidir}/test-requirements.txt
   -r{toxinidir}/requirements.txt
-whitelist_externals = find
+allowlist_externals = find
 commands =
     find . -type f -name "*.py[co]" -delete
     stestr run --slowest {posargs}
@@ -29,7 +27,7 @@ commands =
 commands = {posargs}
 
 [testenv:docs]
-whitelist_externals =
+allowlist_externals =
   rm
 commands =
   rm -rf doc/build
@@ -60,7 +58,7 @@ deps =
 commands = bandit -r oslo_service -n5 -x tests {posargs}
 
 [testenv:releasenotes]
-whitelist_externals =
+allowlist_externals =
   rm
 commands =
   rm -rf releasenotes/build