Allow theme package to participate in private APIs

Author: mirka

packages/private-apis/src/implementation.ts

@@ -30,6 +30,7 @@ const CORE_MODULES_USING_PRIVATE_APIS = [
 	'@wordpress/reusable-blocks',
 	'@wordpress/router',
 	'@wordpress/sync',
+	'@wordpress/theme',
 	'@wordpress/dataviews',
 	'@wordpress/fields',
 	'@wordpress/media-utils',