[Bugfix][TPU] Fix outlines installation in TPU Dockerfile (#6256)

Dockerfile.tpu

@@ -2,18 +2,22 @@ ARG NIGHTLY_DATE="20240601"
 ARG BASE_IMAGE="us-central1-docker.pkg.dev/tpu-pytorch-releases/docker/xla:nightly_3.10_tpuvm_$NIGHTLY_DATE"
 
 FROM $BASE_IMAGE
-
 WORKDIR /workspace
-COPY . /workspace/vllm
 
-ENV VLLM_TARGET_DEVICE="tpu"
 # Install aiohttp separately to avoid build errors.
 RUN pip install aiohttp
 # Install the TPU and Pallas dependencies.
 RUN pip install torch_xla[tpu] -f https://storage.googleapis.com/libtpu-releases/index.html
 RUN pip install torch_xla[pallas] -f https://storage.googleapis.com/jax-releases/jax_nightly_releases.html -f https://storage.googleapis.com/jax-releases/jaxlib_nightly_releases.html
 
 # Build vLLM.
+COPY . /workspace/vllm
+ENV VLLM_TARGET_DEVICE="tpu"
 RUN cd /workspace/vllm && python setup.py develop
 
+# Re-install outlines to avoid dependency errors.
+# The outlines version must follow requirements-common.txt.
+RUN pip uninstall outlines -y
+RUN pip install "outlines>=0.0.43"
+
 CMD ["/bin/bash"]