message: fix: Remove dividers and headers from preview MenuItem Voice Over count
  Fixes:
  Even though screen readers cannot interact with headers and dividers VO incorrectly counts them when announcing how many items a menu has. This adds the big hammer aria-hidden to make sure they are properly ignored.
  [category:Components]
diff: @@ -301,12 +301,13 @@ export class DeprecatedMenuItem extends React.Component<DeprecatedMenuItemProps>
  return (
  <>
  - {hasDivider && <Divider />}
  + {hasDivider && <Divider aria-hidden="true" />}
  <Item
  ref={this.ref}
  tabIndex={-1}
  id={id}
  role={isHeader ? 'presentation' : role}
  + aria-hidden={isHeader ? true : undefined}
  onClick={this.handleClick}
  aria-disabled={isDisabled ? true : undefined}
  isDisabled={!!isDisabled}
  