docs: Keep one unreleased llama.cpp changelog entry

Author: abetlen

CHANGELOG.md

@@ -8,7 +8,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 
 - feat: Update llama.cpp to ggerganov/llama.cpp@f53577432 and sync Python bindings
-- feat: Update llama.cpp to ggerganov/llama.cpp@3bd9aa1f9 and sync Python bindings
 
 ## [0.3.20]