office-ui-fabric-react v7.164.0

Minor changes

• Dropdown: cherry pick #16298 (PR #16959 by joschect)

Patches

• Adds role="presentation" to BasePicker div for screen reader accessibility" (PR #17325 by smhigley)
• cherry picked 'Add jsxRuntime classic pragma (#16863)' from master (PR #17340 by Wezea)