Update changelog for 2.2.3

CHANGELOG.md

@@ -1,3 +1,10 @@
+### [2.2.3] 2021-12-31
+
+  * Fixed issue with PHPUnit and process isolation now including PHPUnit <6.5 (#10387)
+  * Fixed interoperability issue with laminas/laminas-zendframework-bridge and Composer 2.2 (#10401)
+  * Fixed binary proxies for shell scripts to work correctly when they are symlinked (jakzal/phpqa#336)
+  * Fixed overly greedy pool optimization in cases where a locked package is not required by anything anymore in a partial update (#10405)
+
 ### [2.2.2] 2021-12-29
 
   * Added [`COMPOSER_BIN_DIR` env var and `_composer_bin_dir` global](https://getcomposer.org/doc/articles/vendor-binaries.md#finding-the-composer-bin-dir-from-a-binary) containing the path to the bin-dir for binaries. Packages relying on finding the bin dir with `$BASH_SOURCES[0]` will need to update their binaries (#10402)
@@ -1351,6 +1358,7 @@
 
   * Initial release
 
+[2.2.3]: https://github.com/composer/composer/compare/2.2.2...2.2.3
 [2.2.2]: https://github.com/composer/composer/compare/2.2.1...2.2.2
 [2.2.1]: https://github.com/composer/composer/compare/2.2.0...2.2.1
 [2.2.0]: https://github.com/composer/composer/compare/2.2.0-RC1...2.2.0