No loading indicator on submit or reset input buttons

[sonnyp]

Describe the issue

https://picocss.com/docs/loading says any button can have a loading indicator

but aria-busy="true" has no effect on a <input type="submit"/> or <input type="reset"/>

Current Behavior

<input type="submit" aria-busy="true"/>
<input type="reset" aria-busy="true"/>

Displays the buttons without a loading indicator.

Expected Behavior

I expect the same behavior as

<button aria-busy="true"/>