[ngAria] Should not include aria-required on radiobutton or checkboxes

[monkier]

Currently if ng-required exists on an input of type radio or checkbox, aria-required is falsely included.

As per the WAI-ARIA spec, aria-required is not supported for these types of input and aXe-core tests/audit and Google Accessibility Dev Tools audits fail.

ngAria Version: 1.3.20

[gkalpak]

This has already been fixed with #13483 in 1.5.x/1.6.x.