ChangeLog: Set release date

Signed-off-by: Minos Galanakis <minos.galanakis@arm.com>
diff --git a/ChangeLog b/ChangeLog
index 1758e7d..da6fb96 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,6 @@
 Mbed TLS ChangeLog (Sorted per branch, date)
 
-= Mbed TLS x.x.x branch released xxxx-xx-xx
+= Mbed TLS 3.5.0 branch released 2023-10-05
 
 API changes
    * Mbed TLS 3.4 introduced support for omitting the built-in implementation