upgrade icons for UI commons

I am upgrading the icons on the UI-commons module, however, when I load it into the reference application via the browser, I don’t see the new icons. In the stylesheet, I only see the old icons classes.

I know the stylesheet (including icons) for the reference application is already fetched by the time the app is running, so how do I see the changes made to the UI commons module

cc: @dkayiwa