Check only for outdated root dependencies in Cargo checks.

[nullpo-head]

This PR makes cargo outdated check only direct dependencies only in CI.
Currently, CI also checks the versions of all dependencies in the dependency chain of the crates that proxy-wasm-rust-sdk depends on, and fails if it finds an outdated one. However, they are not direct dependencies of proxy-wasm-rust-sdk and cannot be updated by its Cargo.toml.

The current result of cargo outdated.

Name             Project                        Compat  Latest                         Kind    Platform
----             -------                        ------  ------                         ----    --------
chrono->time     0.1.43                         ---     0.1.44                         Normal  ---
getrandom->wasi  0.10.2+wasi-snapshot-preview1  ---     0.10.0+wasi-snapshot-preview1  Normal  cfg(target_os = "wasi")

That of cargo outdated --root-deps-only

All dependencies are up to date, yay!

This PR also includes dependency updates.

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[PiotrSikora]

Thanks! I have similar change in my local tree, so this looks good, but you need to sign the CLA before I can approve this.

Also, could you please split this into 2 separate PRs (one with --root-deps-only, and another with updates to dependencies)? Those are 2 different changes in my mind.

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Thanks for your pull request. It looks like this may be your first contribution to a Google open source project (if not, look below for help). Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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Individual signers

• It's possible we don't have your GitHub username or you're using a different email address on your commit. Check your existing CLA data and verify that your email is set on your git commits.

Corporate signers

• Your company has a Point of Contact who decides which employees are authorized to participate. Ask your POC to be added to the group of authorized contributors. If you don't know who your Point of Contact is, direct the Google project maintainer to go/cla#troubleshoot (Public version).
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[PiotrSikora]

Thanks for signing the CLA! Could you open the other PR as well? Thanks!

[nullpo-head]

@googlebot I signed it!

[nullpo-head]

Thanks so much for your review, Piotr! I've split this PR and opened another one. Although outdated CI is failing for this PR, the other PR to update dependencies will fix it.

[PiotrSikora]

Thanks!