update Dockerfile

Author: bongjunj

Dockerfile

@@ -26,5 +26,4 @@ USER user
 COPY --chown=user:user . optimuzz
 
 WORKDIR /home/user
-RUN git clone --branch llvmorg-20.1.1 --depth 1 https://github.com/llvm/llvm-project.git ~/llvm-project
 ENV LLVM_PATH /home/user/llvm-project