group should be an allowable requiredContext for menuitemcheckbox as of ARIA 1.2

[dbjorge]

Expectation: As of ARIA 1.2 (specifically, PR w3c/aria#737), group has become an acceptable required context role for the menuitemcheckbox role; axe-core should recognize this now that it's picking up other ARIA 1.2 role relationship updates.

Actual: lib/standards/aria-roles.js hasn't been updated to account for that yet, so axe 4.1.1 still reports an aria-required-parent failure for the button in this snippet (codepen):

<div role="group">
  <button role="menuitemcheckbox">test element</button>
</div>

Motivation: false positive in aria-required-parent rule

axe-core version: 4.1.1
axe-webdriver, extension or other integration version: accessibility insights for web 0.23.0

Browser and Assistive Technology versions: Microsoft Edge stable (Version 87.0.664.66 (Official build) (64-bit)), no AT in use

[straker]

We've been having some discussion of this in the PR that was opened for it. There's some issues this causes for screen reader so we're determining what should happen.