Checkout UI Extensions - API Versioning

We have released API versioning for checkout UI extensions. As part of this release, we are also moving checkout UI extensions over to the new ui extension packages.

• For information on how to adopt API versions for existing extensions, [visit our versioning page] (https://shopify.dev/docs/api/checkout-ui-extensions/unstable/versioning-migration)
• For more details on the what and why, see our post on github