Remove unused dependencies

[jplatte]

… and collapse some lines in Cargo.tomls.

[JakkuSakura]

1. Should we put axum-jsonschema into its own repo?
2. As aide is a library, it's better not to rely on specific patch version, as in major.minor.patch. It's a good time to clean them up

[jplatte]

1. No idea, honestly. I don't care about it personally, so would probably default to doing nothing (keeping it here) for now. If you want to make a PR removing it from this repo, let's try to loop the original maintainers in for that decision?
2. I disagree. Specifying a minor/patch version only restricts the minimum, not the maximum version. Since we're not testing the minimum version in CI, I'd rather not lower it. See also https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html

[tamasfe]

Should we put axum-jsonschema into its own repo?

#162, if it was up to me, I'd just move it to an archived repo and update the crates.io package with a notice.

[JakkuSakura]

I disagree. Specifying a minor/patch version only restricts the minimum, not the maximum version. Since we're not testing the minimum version in CI, I'd rather not lower it.

I know this rule. I just had some crazy dependencies that specified =patch version. If they're incompatible, it's tricky to deal with them

[JakkuSakura]

Deal with axum-jsonschema in another PR