Update dependencies

[nicoburns]

This is just the result of running cargo update

[DJMcNab]

If this PR is in service of a release, it also needs to update the Cargo.toml files.
We do the cargo upgrade and cargo update PRs as one PR.

[nicoburns]

@DJMcNab Ok, this now upgrades everything except skrifa/read-fonts which I think ought to be handled separately because I'm not sure how that interacts with upgrading Swash's skrifa dep. @waywardmonkeys probably knows? Is skrifa a public dependency of Swash.

[DJMcNab]

Once CI is fixed, this seems reasonable.

I haven't carefully reviewed the FFI code. The macOS stuff is a trivially correct translation, I'm less sure about the windows change.

[nicoburns]

I'm also not sure about the windows change. I've stripped it out for now so it can be reviewed separately.

[waywardmonkeys]

I guess I'll have to rebase #252 now.

[waywardmonkeys]

For future reference, since this is a library and not an application, you should get in the habit of doing default-features = false on objc2 crates as that changed in the update to 0.6 ... but I'll just get my #252 landed which already does that correctly.