ISTWCMS-6264: make resized images retain the original proportions

src/patterns/04-components/image/_image.scss

@@ -16,6 +16,10 @@
       display: table-caption;
     }
     &__sized-image {
+      /* Ensure sized images maintain proportions despite having dimensions set. */
+      img {
+        height: auto;
+      }
       &--center {
         align-self: center;
         img {