Update composer.json to support illuminate config 12

[taha-moghaddam]

Thank you for helping to make this package better!

Please make sure you've read CONTRIBUTING.md
before submitting your pull request, and that you have:

• provided a rationale for your change (I try not to add features that are going to have a limited user-base)
• checked your coding style with composer run style:check
• analyzed your code with composer run analyze
• added tests
• confirm all old and new tests pass with composer run tests
• documented any change in behaviour (e.g. updated the README.md, etc.)
• only submitted one pull request per feature

Thank you!

[cviebrock]

Thanks for the PR @taha-moghaddam , but there are some other pieces that need to be in place before I can support Laravel 12. Specifically, https://github.com/larastan/larastan needs to have a version that works with L12.

Also, all the illuminate/* packages should be updated, not just illuminate/config. And finally, I would like to see what the PHP requirements are for L12 as well (i.e. will it work on 8.2, or does it require 8.3 or 8.4 even).

Once all of those things are in place (and it might be after L12 is officially launched), I will update this package.