[Build][ROCm] Update Dockerfile.rocm (#19296)

Signed-off-by: Alexei V. Ivanov <alexei.ivanov@amd.com>

Author: Alexei-V-Ivanov-AMD

docker/Dockerfile.rocm

@@ -28,7 +28,8 @@ ARG VLLM_REPO="https://github.com/vllm-project/vllm.git"
 ARG VLLM_BRANCH="main"
 ONBUILD RUN git clone ${VLLM_REPO} \
 	    && cd vllm \
-	    && git checkout ${VLLM_BRANCH}
+	    && git fetch -v --prune -- origin ${VLLM_BRANCH} \
+	    && git checkout FETCH_HEAD
 FROM fetch_vllm_${REMOTE_VLLM} AS fetch_vllm
 
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