fix(rule): ensure DPUB ARIA roles are accepted by aXe 2.6

aXe’s internal API, that Ace monkey patches to register DPUB ARIA Roles,
changed from 2.5 to 2.6.

This commit updates the monkey patch to make it applicable to aXe 2.6.x.

Fixes #140

packages/ace-core/src/scripts/axe-patch-arialookuptable.js

@@ -356,5 +356,5 @@
     },
   };
 
-  Object.assign(axe.commons.aria._lut.role, dpubRoles);
+  Object.assign(axe.commons.aria.lookupTable.role, dpubRoles);
 }(window));