chore(@mendix/image-web): update changelog

Author: uicontent

packages/pluggableWidgets/image-web/CHANGELOG.md

@@ -6,6 +6,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## [Unreleased]
 
+## [1.4.0] - 2023-06-05
+
 ### Changed
 
 -   We updated page explorer's caption to display datasource.