added deprecation for equalTabHeight attribute

src/block/tab-content/deprecated.js

@@ -5,6 +5,16 @@ import { attributes } from './schema'
 import { withVersion } from '~stackable/higher-order'
 
 const deprecated = [
+	{
+		attributes: attributes( '3.12.2' ),
+		migrate: attributes => {
+		   return {
+				...attributes,
+				equalTabHeight: true,
+			}
+		},
+		save: withVersion( '3.12.2' )( Save ),
+	},
 	// Support the new combined opacity and color.
 	{
 		attributes: attributes( '3.11.9' ),