Update changelog (#2912)

Author: GromNaN

CHANGELOG.md

@@ -1,13 +1,14 @@
 # Changelog
 All notable changes to this project will be documented in this file.
 
-## [unreleased]
+## [4.2.1] - 2024-04-25
 
+* Set timestamps when using `Model::createOrFirst()` by @GromNaN in [#2905](https://github.com/mongodb/laravel-mongodb/pull/2905)
 
-## [4.2.0] - 2024-12-14
+## [4.2.0] - 2024-03-14
 
 * Add support for Laravel 11 by @GromNaN in [#2735](https://github.com/mongodb/laravel-mongodb/pull/2735)
-* Implement Model::createOrFirst() using findOneAndUpdate operation by @GromNaN in [#2742](https://github.com/mongodb/laravel-mongodb/pull/2742)
+* Implement `Model::createOrFirst()` using findOneAndUpdate operation by @GromNaN in [#2742](https://github.com/mongodb/laravel-mongodb/pull/2742)
 
 ## [4.1.3] - 2024-03-05