feat: update CHAGENLOG

Author: ericnordelo

packages/core/cairo_alpha/CHANGELOG.md

@@ -2,7 +2,7 @@
 
 ## 3.1.0 (Unreleased)
 
-- Add ERC1155 supply tracking extension () <!-- TODO: Add linked PR>
+- Add ERC1155 supply tracking extension ([#765](https://github.com/OpenZeppelin/contracts-wizard/pull/765))
 
 ## 3.0.0 (2026-01-10)