Dependency spatie/data-transfer-object not maintained anymore

There is a blog post about this:

https://stitcher.io/blog/deprecating-spatie-dto

I've created a Merge Request for this.

Thank you, folks, reviewed the MR. Together with replacing the package name in the composer.json, we should also check for the API changes and replace "use" constructions in the files, and test if all works as well as previously.

Could you please do this? I'm not using this module on my website already, and not a lot of free time, so can't easily test it.