message: fix(link): update _handleClick() interface
  Updates `_handleClick()` method of `<bx-link>` so an inheritend class
  can use the 1st arg, which is the event.
  Refs carbon-design-system/carbon-for-ibm-dotcom#5322.
diff: @@ -61,7 +61,8 @@ class BXLink extends FocusMixin(LitElement) {
  /**
  * Handles `click` event on the `<a>`.
  */
  - protected _handleClick() {} // eslint-disable-line class-methods-use-this
  + // eslint-disable-next-line class-methods-use-this, @typescript-eslint/no-unused-vars
  + protected _handleClick(_: MouseEvent) {}
  /**
  * @returns The inner content.
  