Fix version typo in firebase-messaging/CHANGELOG.md (#5726)

I fixed the typo in the CHANGELOG.md of firebase-messaging module.

Co-authored-by: Rodrigo Lazo <rlazo@users.noreply.github.com>

Author: jja08111

firebase-messaging/CHANGELOG.md

@@ -89,11 +89,10 @@ Kotlin extensions library has no additional updates.
 The Kotlin extensions library transitively includes the updated `firebase-messaging` library. The
 Kotlin extensions library has no additional updates.
 
-# 24.0.0
-
-- [changed] Called messageHandled() after a message has been handled to indicate that the message
-  has been handled successfully.
-- [changed] Added an internal identifier to Firelog logging for compliance.
+# 23.4.0
+* [changed] Called messageHandled() after a message has been handled to indicate
+  that the message has been handled successfully.
+* [changed] Added an internal identifier to Firelog logging for compliance.
 
 # 23.3.1