ext/rustup @0c5da637-0e95-4c70-8a4a-cbf8ef91d475/main

The path at ext/rustup contains a submodule, revision c31b781f1a50f4aa20c2d1b8f9aa661f1fcd4c40. It can be checked out from https://salsa.debian.org/rust-team/rustup.git.