fix: wcadmin react18 createroot marketing coupons (#48832)

Co-authored-by: Gan Eng Chin <ecgan@users.noreply.github.com>

plugins/woocommerce-admin/client/wp-admin-scripts/marketing-coupons/index.js

@@ -1,7 +1,7 @@
 /**
  * External dependencies
  */
-import { render } from '@wordpress/element';
+import { createRoot } from '@wordpress/element';
 
 /**
  * Internal dependencies
@@ -13,9 +13,7 @@ const postForm = document.getElementById( 'posts-filter' );
 if ( postForm ) {
 	const couponRoot = document.createElement( 'div' );
 	couponRoot.setAttribute( 'id', 'coupon-root' );
-
-	render(
-		<CouponsOverview />,
-		postForm.parentNode.appendChild( couponRoot )
+	createRoot( postForm.parentNode.appendChild( couponRoot ) ).render(
+		<CouponsOverview />
 	);
 }

plugins/woocommerce/changelog/fix-wcadmin-react18-createroot-marketing-coupons

@@ -0,0 +1,4 @@
+Significance: patch
+Type: fix
+
+Changed from using React.render to React.createRoot for marketing coupons as it has been deprecated since React 18