update changelog

Author: enitrat

CHANGELOG.md

@@ -4,6 +4,8 @@
 
 * chore: update Rust required version to 1.85.0 [#1990](https://github.com/lambdaclass/cairo-vm/pull/1990)
 
+* 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)