s/whitelist/allowlist/ and update dennis

tox.ini

@@ -13,11 +13,11 @@ commands = pytest --base-url http://olympia.test --verify-base-url --reruns 1 te
 
 
 [testenv:dennis-lint]
-deps = dennis==0.9
+deps = dennis==1.1.0
 # Run via `bash -c` to make sure the file globbing is properly resolved in the shell
 commands =
   bash -c 'dennis-cmd lint locale/*/LC_MESSAGES/*.po --rules W202'
   bash -c 'dennis-cmd lint --errorsonly locale/*/LC_MESSAGES/*.po'
   bash -c 'dennis-cmd lint --errorsonly locale/templates/LC_MESSAGES/*.pot'
-whitelist_externals =
+allowlist_externals =
   bash