Update rust-installer

[Eijebong]

This removes the last dependency on rayon 0.9

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @alexcrichton (or someone else) soon.

If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes.

Please see the contribution instructions for more information.

[Eijebong]

Actually, I didn't see it before but the installer has a lot of outdated dependencies. It might be a better idea to wait for those to be bumped (working on it right now).

[alexcrichton]

@bors: r+

[bors]

📌 Commit 75fd910 has been approved by alexcrichton

[Eijebong]

@alexcrichton I repushed a second bump now that all dependencies are up to date in rust-installer

[alexcrichton]

@bors: r+

[bors]

📌 Commit 4858065 has been approved by alexcrichton

[alexcrichton]

@bors: rollup