Auto merge of #2592 - jtgeibel:cargo-update, r=JohnTitor
Auto merge of #2592 - jtgeibel:cargo-update, r=JohnTitor

Run `cargo update`

We've made a lot of piecemeal updates to backend dependencies over the last few months. It seems like we should be good to try a full `cargo update`.

The full details of the changes are listed in the commit message.

r? @JohnTitor

rust-lang/crates.io,rust-lang/crates.io,rust-lang/crates.io,rust-lang/crates.io