We received an email from Shopify regardin,
Your app have been detected as using the Embedded App SDK (EASDK) or its backwards compatibility layer, which will be removed from Shopify on Jan 1, 2022
We have a Published Shopify app created 2 years ago using Embedded SDK. What we have done is:
<link rel="stylesheet" href="https://sdks.shopifycdn.com/polaris/latest/polaris.css" />
To migrate this current version to App Bridge what all we need to change?