Fix issues related to tox4

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

Change-Id: Iec7659dbf64847d86def2a863cda8b5c49c65c3b

tox.ini

@@ -1,17 +1,15 @@
 [tox]
 minversion = 3.1
 envlist = py3,pep8
-ignore_basepython_conflict = true
 
 [testenv]
-basepython = python3
 deps =
   -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
   -r{toxinidir}/test-requirements.txt
   -r{toxinidir}/requirements.txt
 # Functional tests with Eventlet involve monkeypatching, so force them to be
 # run in a separate process
-whitelist_externals = env
+allowlist_externals = env
 commands =
   stestr run --slowest (?!tests.test_functional_eventlet)tests {posargs}
   env TEST_EVENTLET=1 stestr run --slowest tests.test_functional_eventlet
@@ -40,7 +38,7 @@ 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
@@ -63,7 +61,7 @@ commands = python benchmark/benchmark.py
 commands = python3 benchmark/benchmark.py
 
 [testenv:releasenotes]
-whitelist_externals = rm
+allowlist_externals = rm
 deps =
   -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
   -r{toxinidir}/doc/requirements.txt