More actions button is an anchor

The region to drop down more actions has a link nature instead of a button.
Quick definitions:

Links take the user somewhere, buttons do things

More formal definitions, from mdn web docs:

The <a> HTML element (or anchor element), with its href attribute, creates a hyperlink to web pages, files, email addresses, locations in the same page, or anything else a URL can address.

The <button> HTML element is an interactive element activated by a user with a mouse, keyboard, finger, voice command, or other assistive technology. Once activated, it then performs an action, such as submitting a form or opening a dialog.

Here, we want to open a dialog, so we should use a button.
This change is important for screen readers: they won't read the region the same way depending on its nature.