Bump cargo_metadata from 0.5.6 to 0.5.8

[dependabot-preview]

Bumps cargo_metadata from 0.5.6 to 0.5.8.

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[killercup]

@ordian, @bjgill, I just enabled dependabot for this repo to test it. Since cargo-edit is a binary crate, it makes sense to regularly update our dependencies to their latest patch versions.

This is quite a bit of noise initially (sorry!), and I'll merge these first PRs today.

I can set this up to {update all, update security-relevant patches} ⨉ {"live", daily, weekly, monthly}. I've also set it to only update the lock file -- we should do regular version bumps manually anyway. What do you think is a good setting? At first I set it to "all", "monthly" (which these PRs are from), but I think "security patches", "daily" is a better choice.

[ordian]

@killercup I don't have a strong opinion on this. How does it determine "security patches", via advisory-db (in that case I think it's gonna be silent for quite a while). Your initial choice sounds reasonable to me.

[bjgill]

Interesting. I wasn't previously aware of dependabot. Seems like a sensible idea.

I could see advantages to both all monthly and security patches daily. It's a pity we can't have both simultaneously, perhaps. Given that the rate of additions to advisory-db is low, it might be that monthly all is good enough to get vulnerability fixes in a vaguely timely fashion. I don't have strong feelings about this question, though.

[killercup]

How does it determine "security patches", via advisory-db (in that case I think it's gonna be silent for quite a while).

Yeah, https://dependabot.com/rust.html says it "checks your dependencies against the RustSec Advisory Database".

It's a pity we can't have both simultaneously, perhaps.

I opened an issue with them: dependabot/feedback#102

[killercup]

From <dependabot/feedback#102>:

For security updates we always create the PRs immediately (because we can't imagine a use case where you wouldn't want that), so Dependabot should do exactly what you want with that setup.

So I've set it to monthly :)

[dependabot-preview]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.