Automated submodule update: tensorpipe (pytorch#70438)

Summary:
This is an automated pull request to update the first-party submodule for [pytorch/tensorpipe](https://github.com/pytorch/tensorpipe).

New submodule commit: pytorch/tensorpipe@52791a2

Pull Request resolved: pytorch#70438

Test Plan: Ensure that CI jobs succeed on GitHub before landing.

Reviewed By: zertosh

Differential Revision: D33331758

fbshipit-source-id: 1e811ddc30e9afa440523c6cb5c4e893eb560978