docs(#25): this commit updates CHANGELOG to reflect version change from 4.2.1 to 4.2.5

Author: https-richardy

CHANGELOG

@@ -2,7 +2,7 @@
 
 this patch fixes an issue in the authorization_code flow where the access token issued for an authenticated user did not include the allowed audiences configured on the requesting client. this created a mismatch between the client context that initiated authorization and the resulting user token.
 
-starting in 4.2.1, when a client obtains an authorization code and exchanges it for an access token, the generated user access token now includes all allowed audiences configured for that client. in the same flow, the authorization code is also bound to the client context to ensure exchange consistency.
+starting in 4.2.5, when a client obtains an authorization code and exchanges it for an access token, the generated user access token now includes all allowed audiences configured for that client. in the same flow, the authorization code is also bound to the client context to ensure exchange consistency.
 
 # 4.2.0 - 2026-04-24