chore(iOS): bump socket rocket to 0.7.1 (#46300)

Summary:
This PR bumps Socket Rocket to 0.7.1, this release brings some new improvements and visionOS support. I've also moved the version to a constant.

## Changelog:

[INTERNAL] [CHANGED] - Bump SocketRocket to 0.7.1

Pull Request resolved: https://github.com/facebook/react-native/pull/46300

Test Plan: CI Green

Reviewed By: cortinico, cipolleschi

Differential Revision: D62294833

Pulled By: blakef

fbshipit-source-id: 0e45c7de041710fb1f500b0ac23898b68a8a8936