Update change log with details of release v2.2.3

Author: delphidabbler

CHANGELOG.md

@@ -8,6 +8,12 @@ From v2.0.0 all notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## v2.2.3 of 2025/04/03
+
+* Added results of compiling with Delphi 12 for all snippets with no pre-existing compile results for that compiler (issue [#27](https://github.com/delphidabbler/code-snippets/issues/27)).
+* Fixed memory leak in the `CountOccurences` function (issue [#54](https://github.com/delphidabbler/code-snippets/issues/54)).
+* Updated `GetGIFSize` function to work around a deprecated warning with Delphi 12 and some earlier compilers because of a call to `SysUtils.StrLComp` which has been moved to the `AnsiStrings` unit (issue [#52](https://github.com/delphidabbler/code-snippets/issues/52)).
+
 ## v2.2.2 of 2025/01/19
 
 * New snippets were added to the _Arrays_ and _Mathematics_ categories: