Update Changelog

Author: oleibman

CHANGELOG.md

@@ -5,12 +5,17 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com)
 and this project adheres to [Semantic Versioning](https://semver.org).
 
-## 2.1.1 - TBD
+## 2024-09-29 2.1.1
 
 ### Fixed
 
 - Backported security patches.
 - Change to Csv Reader (see below under Deprecated). Backport of PR #4162 intended for 3.0.0. [Issue #4161](https://github.com/PHPOffice/PhpSpreadsheet/issues/4161)
+- Tweak to AMORDEGRC. Backport of PR #4164 intended for 3.0.0.
+
+### Changed
+
+- Images will not be added to spreadsheet if they cannot be validated as images.
 
 ### Deprecated