added boto3 without any specific pin

Author: Bhanu Teja Goshikonda

pytorch/training/docker/2.7/py3/Dockerfile.cpu

@@ -324,6 +324,8 @@ RUN pip install --no-cache-dir -U torch==${PYTORCH_VERSION} \
 
 # Install SM packages
 RUN pip install --no-cache-dir -U \
+     # address package regression caused by smclarify depedency s3fs"
+    "boto3 \
     smclarify \
     "sagemaker>=2.9.0,<3" \
     "sagemaker-experiments<1" \