chore: run 'cargo update'

Summary: Dependabot will update all of our "first-party" dependencies that
we list in Cargo.toml, but that doesn't mean it will pick up transitive
dependencies that might also see minor semver compatible bumps. `cargo update`
handles that for us, instead.

Ideally, this would be handled as a separate dependabot flow, but I don't know
how to do that...

Signed-off-by: Austin Seipp <[email protected]>
Change-Id: I12cd2e03e2863abd8ed961304685d276