Update cargo dependencies

cargo's dependency management is really a double-edged sword. I'd very
much prefer the distributions to package and update dependencies, but
cargo also makes it very easy to bring in code without needing to vendor
packages or similar.

I suppose everything has trade-offs. With C, I would either have to make
a separate shared library or vendor code, resulting in code duplication.
With Cargo, I can rely on `crates.io` to provide tidbits of code to me,
but I'll have to keep them updated by running `cargo update` and `cargo
upgrade` often.

Change-Id: Ib5cee6f63f1e895dcefe12920755ecb25f994305

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