Prevent javascript URLs warning in React 16.9

[hannes-o-brunner]

@salesforce/design-system-react@0.10.12

React 16.9 emits the following warning:

Warning: A future version of React will block javascript: URLs as a security precaution. Use event 
handlers instead if you can. If you need to generate unsafe HTML try using 
dangerouslySetInnerHTML instead. React was passed "javascript:void(0);".

See facebook/react#16592 for the feature issue
And some related discussions here: facebook/react#16382

[stale]

This issue has been automatically marked as stale, because it has not had recent activity. It will be closed if no further activity occurs. Maintainers are responsible for tech debt and project health. This is most likely a new components or component feature request. Please submit a pull request for or request feedback on this feature. Thank you.

[xoob]

Just a heads-up, this is causing npm run test:unit to fail hard.

  SLDSAlert:
    Dismiss alert
      ✗ "before each" hook: mountComponentInside for "calls onRequestClose handler"
	Error: Warning: A future version of React will block javascript: URLs as a security precaution. Use event handlers instead if you can. If you need to generate unsafe HTML try using dangerouslySetInnerHTML instead. React was passed %s.%s