Basic support for Scala 3 and update libraries to latest versions

[lolgab]

Fixes #18
Closes #16

[lolgab]

@tindzk Are you interested in merging this PR and releasing a new version for Scala 3 support?

[lolgab]

CI is now green https://github.com/lolgab/toml-scala/actions/runs/11415850054

[tindzk]

Thank you for your pull request, @lolgab. Unfortunately, I am no longer maintaining this library. If you are interested in taking over maintenance, I would be happy to link to your fork in the README and then archive this repository.

[keynmol]

Hi @tindzk!

@lolgab and I talked and I've set up a fork over at https://github.com/indoorvivants/toml-scala – it's already publishing releases (https://index.scala-lang.org/indoorvivants/toml-scala) and I've added a badge acknowledging the original repository.

With that, this PR can be closed, and if you could please link the fork in the README/description that would be great.

Thanks for all your work!

[tindzk]

Thanks for taking over the maintenance of this project! I have updated the README and will be archiving the repository shortly.