message: fix(accordion): make chevron center-aligned
  We had a recent change in accordion style presumably to support
  multi-lines accordion title. However, the change made the text
  top-aligned for single line condition, and the CSS actually didn't
  support multi-lines accordion title. This change fixes those problems.
diff: @@ -18,6 +18,13 @@ $css--plex: true !default;
  display: block;
  outline: none;
  +
  + .#{$prefix}--accordion__heading {
  + padding-top: calc((#{$container-03} - #{map-get($body-long-01, 'line-height')}) / 2);
  + padding-bottom: calc((#{$container-03} - #{map-get($body-long-01, 'line-height')}) / 2);
  + height: auto;
  + min-height: $container-03;
  + }
  }
  :host(#{$prefix}-accordion-item[open]) {
  