[4.x] Laravel 12 support

[stancl]

This PR adds Laravel 12 support and drops support for all other Laravel versions.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.74%. Comparing base (657e165) to head (9d86178).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1321   +/-   ##
=========================================
  Coverage     84.74%   84.74%           
- Complexity     1063     1071    +8     
=========================================
  Files           177      177           
  Lines          3100     3101    +1     
=========================================
+ Hits           2627     2628    +1     
  Misses          473      473           

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[Jacobtims]

@stancl Why did you drop support for Laravel 11?

[stancl]

It is easier to update the average app to Laravel 12 than for us to maintain compatibility with both L11 and L12.

[Jacobtims]

There are still a lot of other packages that don't support L12, Now I can't update my tenancy projects.

[stancl]

You can lock the tenancy version to an older commit that supports Laravel 11 and only switch back to dev-master when you can update your entire app. We'll soon be pushing changes that will likely depend on changes made to Laravel 12 — it would make no sense to support Laravel 11.

[Jacobtims]

When I lock it to an older commit, composer will still look at the latest composer.json. That doesn't work unfortunately...