office-ui-fabric-react v7.85.0

Minor changes

• GroupedList: Add role prop to groupProps (PR #11791 by erichdev)

Patches

• add icon support to combobox (PR #11629 by makopch-ms)
• SpinButton: Making disabled SpinButtons non-focusable. (PR #11783 by khmakoto)
• SearchBox: Dispose of EventGroup on unmount (PR #11806 by KevinTCoughlin)
• PersonaCoin and related components: elliminating BaseComponent usage to reduce bundle size. (PR #11804 by dzearing)