update changelog

Author: enitrat

CHANGELOG.md

@@ -14,6 +14,8 @@
 
 * chore: Update fastecdsa python package [#1993](https://github.com/lambdaclass/cairo-vm/pull/1993)
 
+* fix: `mod_builtin_fill_memory` could be stuck in an infinite loop [#1975](https://github.com/lambdaclass/cairo-vm/issues/1975)
+
 #### [2.0.0] - 2025-02-26
 
 * fix: Check overflow in cairo pie address calculation [#1945](https://github.com/lambdaclass/cairo-vm/pull/1945)