office-ui-fabric-react v7.22.0

Minor changes

• DetailsList: Assign button role to group toggle element if aria-label provided. (commit)
• Update SASS variables using script (commit by phkuo, PR #10093)

Patches

• Moved role, aria-label, and aria-expanded to the same element as per aria requirements (commit by suryasu, PR #9918)
• DetailsRow should only re-render if a prop is detected to have changed. (commit by XpRv, PR #10080)