Pin nvidia-cublas-cu12 to version 12.9.1.4 in Dockerfile.ci to ensure consistent dependency management in the CI environment.

Signed-off-by: Taichang Zhou <tzhouam@connect.ust.hk>

docker/Dockerfile.ci

@@ -20,6 +20,9 @@ RUN apt-get update && \
 # causing it to fall back to the older stable release from PyPI.
 RUN uv pip install --system --upgrade --force-reinstall --prerelease=allow vllm --extra-index-url https://wheels.vllm.ai/4a1550d22d7058e129d0e1257e726b3bf4a77025
 
+# Pin nvidia-cublas-cu12 to a specific version
+RUN uv pip install --system --upgrade --force-reinstall "nvidia-cublas-cu12==12.9.1.4"
+
 # # Keep flashinfer runtime packages in version sync.
 # # We derive the version from installed flashinfer (pulled by vllm)
 # # and enforce the same version for flashinfer-cubin / flashinfer-jit-cache.