Minor changes
- Update GroupList and Grouped DetailsList semantics to work with screen readers (PR #14835 by smhigley)
- Support StrictMode in DetailsList hierarchy (PR #14980 by ThomasMichon)
- Add Callout prop allowDismissOnTargetClick boolean. (PR #15077 by taenri)
- Adding an elementRef to BaseButton.tsx to allow access to the root DOM element. (PR #15196 by czearing)