[auto] Update cargo dependencies

```console
$ cargo update
    Updating crates.io index
     Locking 5 packages to latest compatible versions
    Updating cc v1.1.30 -> v1.1.31
    Updating libc v0.2.159 -> v0.2.161
    Updating prettyplease v0.2.22 -> v0.2.24
    Updating proc-macro2 v1.0.87 -> v1.0.88
    Updating syn v2.0.79 -> v2.0.82
note: pass `--verbose` to see 8 unchanged dependencies behind latest
```

Author: expressvpn-iat-bot