chore(dev): upgrade to Rust 2024 edition

[pront]

Summary

Apart from the obvious update, it downgrades cargo-deb to 2.9.1.

I discovered that the cargo-deb used by packaging is actually the one in the Vector Docker image. Something to improve in the future.

Vector configuration

How did you test this PR?

Change Type

• Bug fix
• New feature
• Non-functional (chore, refactoring, docs)
• Performance

Is this a breaking change?

• Yes
• No

Does this PR include user facing changes?

• Yes. Please add a changelog fragment based on our guidelines.
• No. A maintainer will apply the no-changelog label to this PR.

References

Ref: kornelski/cargo-deb#183

Ref: migration log
2024_migration.txt

Notes

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[datadog-vectordotdev]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

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[thomasqueirozb]

Changes also needed to .rustfmt.toml I think