Add Laravel 13 support + modernise CI matrix (currently Laravel 10 only)

[SimonBarrettACT]

Tracking Laravel 13 readiness for the People app (ACT-Training/people#3153, #3155).

Current state

This package has no direct illuminate/* / laravel/framework dependency, and its runtime requires already resolve on Laravel 13:

• secondnetwork/blade-tabler-icons ^3.24 → latest (v3.44.0) supports illuminate/support ^13.0 ✅
• spatie/laravel-package-tools ^1.14 → latest supports illuminate/contracts ^13.0 ✅
• livewire/livewire ^3|^4 ✅

So 2.4.0 (the version People pins) is effectively already L13-compatible. Laravel Shift flags it because it's pinned exact with no explicit Laravel support declared.

Gap to close (this one is real)

CI is badly out of date — it only proves Laravel 10:

• run-tests.yml matrix: laravel: [10.*] only (no 11/12/13).
• orchestra/testbench is ^9.0 (Laravel 11 era).

Done when

• Bump orchestra/testbench to allow ^11 (Laravel 13) alongside existing — e.g. ^9|^10|^11; bump Pest if testbench 11 requires Pest 4.
• Update the run-tests.yml Laravel matrix from 10.* to cover 11.*, 12.*, 13.*.
• Green suite on Laravel 13 (watch the TableBuilder paths People relies on across Settings pages).
• Tag a patch release (e.g. 2.4.1) so People can require a provably-L13 version.

Note: no production code change is expected unless a real L11→L13 incompatibility surfaces — primarily CI modernisation + proof.

[SimonBarrettACT]

Completed in 2.4.1 (on Packagist). Replaced the Laravel-10-only CI with an 11/12/13 matrix (testbench 9/10/11, PHP 8.3/8.4) and bumped the dev toolchain (Pest ^3.8|^4, larastan ^3). Suite passes on Laravel 13.15.