message: fix(header-menu): updating chevron to match react version
diff: /**
  * @license
  *
  - * Copyright IBM Corp. 2019, 2020
  + * Copyright IBM Corp. 2019, 2021
  *
  * This source code is licensed under the Apache-2.0 license found in the
  * LICENSE file in the root directory of this source tree.
  import settings from 'carbon-components/es/globals/js/settings';
  import { ifDefined } from 'lit-html/directives/if-defined';
  import { html, property, query, customElement, LitElement } from 'lit-element';
  -import ChevronDownGlyph from '@carbon/icons/lib/chevron--down';
  +import ChevronDownGlyph from '@carbon/icons/lib/chevron--down/16';
  import FocusMixin from '../../globals/mixins/focus';
  import HostListenerMixin from '../../globals/mixins/host-listener';
  import HostListener from '../../globals/decorators/host-listener';
  