Revert "Update src/internal/components/ScrollableRegion.tsx"

This reverts commit 37d3231.

Author: strackoverflow

src/internal/components/ScrollableRegion.tsx

@@ -3,7 +3,7 @@ import Box from '../../Box'
 import {useOverflow} from '../hooks/useOverflow'
 
 type ScrollableRegionProps = React.PropsWithChildren<{
-  'aria-labelledby': string
+  'aria-labelledby'?: string
   className?: string
 }>