Add support for Laravel 10

[jnoordsij]

Description

Add support for Laravel 10.

Motivation and Context

Fixes #218.

How Has This Been Tested?

Add Laravel 10 to the GitHub workflow tests.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Documentation only (no code changes)

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

ToDo:

• [x] Requires #219 to be merged (this branch is based on it)
• [ ] Requires upstream Laravel 10 support on graham-campbell/testbench, see also https://github.com/GrahamCampbell/Laravel-TestBench/issues/29.

[sandervanhooft]

Thanks for the effort @jnoordsij, also noted your PR on graham-campbell/testbench.

I decided to work around the graham-campbell package for now so we can go ahead and release Laravel 10 support asap. See #225

[jnoordsij]

@sandervanhooft ah that works as well! You might have saved a little work by starting from here, but probably these changes weren't that hard to figure ;)

Thanks for adding the support!