Describe the bug
When using the DropDownList in combination with its label and aria-required props the aria-required is not correctly rendered

To Reproduce

1. Open this CodeSandbox project
2. Open the browser's DevTools
3. Inspect the DropDownlist
4. See where the aria-required attribute is rendered

Expected behavior
The aria-required attribute should be rendered on the element with the "combobox" role.

Screenshots