Merge "Bump minimum tox version to 3.18.0"

tox.ini

@@ -1,13 +1,13 @@
 [tox]
-minversion = 1.6
+minversion = 3.18.0
 envlist = linters,publishdocs
 skipsdist = True
 
 [testenv]
-basepython = python3
 setenv =
-   VIRTUAL_ENV={envdir}
-deps = -r{toxinidir}/test-requirements.txt
+  VIRTUAL_ENV={envdir}
+deps =
+  -r{toxinidir}/test-requirements.txt
 allowlist_externals =
   bash
   cp
@@ -51,6 +51,8 @@ commands =
   {toxinidir}/tools/build-all-rst.sh
 
 [testenv:generatepot-rst]
+allowlist_externals =
+  {toxinidir}/tools/generatepot-rst.sh
 # Generate POT files for translation, needs {posargs} like:
 # tox -e generatepot-rst -- security-guide
 commands = {toxinidir}/tools/generatepot-rst.sh {posargs}