CHANGELOG: add description for patch 3374

Author: dannywillems

CHANGELOG.md

@@ -23,7 +23,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### [folding](./folding)
 
 #### Changed
-- (No changes in current release)
+- Remove crate as it will never be used
+  ([#3374](https://github.com/o1-labs/proof-systems/pull/3374))
 
 ### [groupmap](./groupmap)