CHANGELOG: add description for patch 1305

Author: dannywillems

CHANGELOG.md

@@ -62,6 +62,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Use consistent `use` statements for fields. Replace `mina_hasher::Fp` with
   `mina_curves::pasta::Fp`.
   ([#1269](https://github.com/o1-labs/openmina/pull/1269/)).
+- **CI**: set fail-fast to false to prevent cancellation of other jobs
+  ([#1305](https://github.com/o1-labs/openmina/pull/1305))
 
 ### Fixed