Removed role from link

[ci skip]

app/assets/javascripts/issue_show/components/locked_warning.vue

@@ -13,8 +13,7 @@
     Someone edited the issue at the same time you did. Please check out
     <a
       :href="currentPath"
-      target="_blank"
-      role="button">the issue</a>
+      target="_blank">the issue</a>
     and make sure your changes will not unintentionally remove theirs.
   </div>
 </template>