Prepare release 4.2.4

Author: ste93cry

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+## 4.2.4 (2021-10-20)
+
 - Add return typehints to the methods of the `SentryExtension` class to prepare for Symfony 6 (#563)
 - Fix setting the IP address on the user context when it's not available (#565)
 - Fix wrong method existence check in `TracingDriverConnection::errorCode()` (#568)