chore: reformat using `cargo +nightly fmt --all`

[eirnym]

Checklist:

• [x] cargo +nightly fmt --all
• [ ] Modify CHANGELOG.md if applicable

[eirnym]

Questions to maintainers:

• Should I create CI workflow to enforce pre-commit run?
• Should I reformat toml files using taplo as well?
• if taplo is advised, should I add it to pre-commit hook?

[dpc]

I already started using taplo with autoformatting in my projects and I think it's a nice improvement tying into how i like uniform Rust code formatting, so :+1: from me, but ping @kornelski .

[eirnym]

In my projects I use pre-commit hook to format code and toml, as well as check it on CI using the same pre-commit. You can check how I've done it here. In my CI i wait for all checks to be done, which is a separate small CI job.