A team of data scientists is utilizing Amazon SageMaker instances and SageMaker APIs within a VPC that is completely isolated from the internet to train their machine learning models. The datasets required for training these models are stored in an Amazon S3 bucket, which is accessible through interface VPC endpoints. Occasionally, the data scientists need to update their Python packages using the Python Package Index (PyPI) repository. A solutions architect is tasked with ensuring access to PyPI while maintaining the isolation of the SageMaker instances from the internet. What solution should the architect implement to fulfill these requirements?