Describe the bug
Aria label can not be set in an icon only DropDownButton

To Reproduce
Inspect the button element

https://stackblitz.com/edit/gvk8hm-s2fmdf?file=src%2Fmain.vue

Expected behavior
We can set aria-label

Screenshots
The aria label can be set to some value

Workaround :
https://stackblitz.com/edit/gvk8hm-tquawk?file=src%2Fmain.vue