Address deprecation warning about whitelist_externals

Author: JasperCraeghs

tox.ini

@@ -3,14 +3,14 @@ envlist = benchmark, test, examples, doc
 isolated_build = True
 
 [testenv:benchmark]
-whitelist_externals = poetry
+allowlist_externals = poetry
 commands=
     poetry install
     python tests/test_parser.py
 
 [testenv:examples]
 changedir = examples
-whitelist_externals =
+allowlist_externals =
     doxygen
     poetry
 commands=
@@ -19,13 +19,13 @@ commands=
     sphinx-build -W -b html . {envtmpdir}/examples/_build
 
 [testenv:test]
-whitelist_externals = poetry
+allowlist_externals = poetry
 commands=
     poetry install
     pytest
 
 [testenv:doc]
-whitelist_externals = poetry
+allowlist_externals = poetry
 commands=
     poetry install
     sphinx-build -W -b linkcheck -d {envtmpdir}/doctrees doc {envtmpdir}/linkcheck