CHANGELOG: add description for patch 1244

Author: dannywillems

CHANGELOG.md

@@ -40,6 +40,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#1234](https://github.com/o1-labs/openmina/pull/1234))
 - **Formatting**: Standardized markdown and MDX files to 80-character line
   wrapping ([#1234](https://github.com/o1-labs/openmina/pull/1234))
+- **Build warnings**: Fix the warnings generated by the missing lifetime
+  ([#1244](https://github.com/o1-labs/openmina/pull/1244))
 
 ### Dependencies