CHANGELOG: add entry for itertools

Author: dannywillems

CHANGELOG.md

@@ -11,6 +11,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - bump proc-macro2 from 1.0.93 to 1.0.95
   ([#1230](https://github.com/o1-labs/openmina/pull/1230))
+- bump itertools from 0.10.5 to 0.12.0 #1228
+  ([#1228](https://github.com/o1-labs/openmina/pull/1228))
 
 ## [0.16.0] - 2025-04-04