message: fix(footer): add carbon accordion styles to theme mixin
diff: //
  @import '../../temp-carbon-expressive/accordion/accordion-expressive';
  +@import 'carbon-components/scss/components/accordion/accordion';
  /// Footer nav styles
  /// @access private
  @include exports('footer-nav') {
  @include carbon--theme($carbon--theme--g90) {
  + @include accordion;
  @include footer-nav;
  }
  }
  