a11y - Violation in Utils

[francinelucca]

The Gatsby theme utils wrapping div currently has aria-label but no role on it and it is triggering the following violation:
The ARIA attributes "aria-label" are not valid for the element <div> with implicit ARIA role "generic"

Steps to reproduce the issue

1. Go to a website that uses Gatsby Utils (i.e.: https://carbondesignsystem.com/)
2. Scroll down the page enough so that you can see the backtotop and feedback buttons
3. Run Accessibility Checker on the page
   4.Notice a11y violation

Additional information