Keep using the same version of rand crate

This change is no-op, just renaming an existing 3p dep.

Rand is being updated to the latest version. In the meantime, point
existing users to the soon-to-be previous version.

Bug: 420420630
Test: treehugger
Change-Id: I03180984c209a9cd44f99dd8e3c285003976d3dc
3 files changed