[docker] pin tokenizers version in neuronx

serving/docker/pytorch-inf2.Dockerfile

@@ -30,6 +30,7 @@ ARG torch_xla_version=2.1.6
 ARG libneuronxla_version=2.1.681.0
 
 ARG transformers_version=4.45.2
+ARG tokenizers_version=0.20.3
 ARG accelerate_version=0.29.2
 ARG diffusers_version=0.28.2
 ARG pydantic_version=2.6.1
@@ -107,14 +108,16 @@ RUN mkdir -p /opt/djl/bin && cp scripts/telemetry.sh /opt/djl/bin && \
     pydantic==${pydantic_version}  \
     optimum  \
     tiktoken  \
-    blobfile && \
+    blobfile \
+    msgspec && \
     # Install packages with no-deps flag
     pip install --no-deps \
     neuronx_distributed_inference==${neuronx_distributed_inference_version} \
     optimum-neuron==${optimum_neuron_version} \
     transformers-neuronx==${transformers_neuronx_version} \
     ${vllm_wheel} \
-    transformers==${transformers_version} && \
+    transformers==${transformers_version} \
+    tokenizers==${tokenizers_version} && \
     # Install s5cmd and patch OSS DLC
     scripts/install_s5cmd.sh x64 && \
     scripts/patch_oss_dlc.sh python && \