office-ui-fabric-react v7.81.0

Minor changes

• Change focus class behavior: Alternate between 'hidden' and 'visible' classes (PR #11642 by paflakst)

Patches

• Consume compose functions where appropriate (commit)
• Popup: fix an issue where onBlur would not correctly update focus state (PR #11630 by joschect)
• Dropdown: fix missing asterisk on focused dropdown (PR #11663 by xugao)