Bump rustup from `9309d66` to `3f9e3ba`
Bump rustup from `9309d66` to `3f9e3ba`

Bumps [rustup](https://github.com/rust-lang-nursery/rustup.rs) from `9309d66` to `3f9e3ba`.
- [Release notes](https://github.com/rust-lang-nursery/rustup.rs/releases)
- [Commits](https://github.com/rust-lang-nursery/rustup.rs/compare/9309d66429a879e3c1e919f410593627df69d32d...3f9e3bad3cb1af206d2d47c298aa5d5f935cc23d)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
nrc/rustc-perf,nrc/rustc-perf,nrc/rustc-perf