Use 5:4 aspect ratio for the carousel component

Author: abeddow91

dotcom-rendering/src/components/Carousel.importable.tsx

@@ -532,6 +532,7 @@ const CarouselCard = ({
 				index={index}
 				showTopBarDesktop={!isOnwardContent}
 				showTopBarMobile={!isOnwardContent}
+				aspectRatio={'5:4'}
 			/>
 		</LI>
 	);