Drop support for older Laravels, apply formatting

[dwightwatson]

• Only support Laravel 13
• Use Pint for consistent formatting

[Copilot]

Pull request overview

This PR updates the package’s supported framework/tooling targets to Laravel 12/13 and applies consistent formatting (Pint-style), alongside related test and code cleanup.

Changes:

• Update Composer constraints to only allow Illuminate 12/13, add Pint, and bump PHPUnit.
• Update CI matrix to run against Laravel 12/13 and newer PHP versions.
• Reformat source/tests and modernize PHPUnit setUp() visibility + test method naming.

Reviewed changes

Copilot reviewed 15 out of 17 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
composer.json	Drops Illuminate 9–11, bumps PHPUnit, adds Pint.
.github/workflows/run-tests.yml	Updates PHP/Laravel test matrix to newer versions.
src/ValidationException.php	Reorders imports/docblocks; adjusts return type annotations.
src/ValidatingTrait.php	Import/docblock tweaks + formatting updates.
src/ValidatingObserver.php	Docblock/formatting updates; string formatting.
src/ValidatingModel.php	Docblock return type simplification + import.
src/ValidatingInterface.php	Import/docblock updates.
tests/TestCase.php	Reorders imports and changes base TestCase from abstract to concrete.
tests/ValidationExceptionTest.php	Formatting + setUp() visibility + test naming.
tests/ValidatingTraitTest.php	Formatting + setUp() visibility + test naming + stub updates.
tests/ValidatingObserverTest.php	Formatting + setUp() visibility + test naming.
tests/ValidatingModelTest.php	Formatting + test naming + removes unused import.
tests/Injectors/UniqueWithInjectorTest.php	Formatting + setUp() visibility + test naming + imports.
tests/Injectors/UniqueInjectorTest.php	Formatting + setUp() visibility + test naming + imports.
src/Injectors/UniqueWithInjector.php	Formatting (concat spacing/docblocks).
src/Injectors/UniqueInjector.php	Formatting (concat spacing/docblocks).

Comments suppressed due to low confidence (1)

src/ValidatingObserver.php:45

• These docblocks say the observer methods return bool, but performValidation() returns null in multiple branches (e.g., when validation is skipped or a validating event returns non-null). Update the documented return types to reflect the actual bool|null behavior (or make the methods consistently return a boolean).

     * @return bool
     */
    public function saving(Model $model)
    {
        return $this->performValidation($model, 'saving');
    }

    /**
     * Register the validation event for restoring the model.
     *
     * @return bool
     */
    public function restoring(Model $model)
    {
        return $this->performValidation($model, 'restoring');
    }

    /**
     * Perform validation with the specified ruleset.
     *
     * @param  string  $event
     * @return bool
     */
    protected function performValidation(Model $model, $event)
    {
        // If the model has validating enabled, perform it.
        if ($model->getValidating()) {
            // Fire the namespaced validating event and prevent validation
            // if it returns a value.
            if ($this->fireValidatingEvent($model, $event) !== null) {
                return;
            }

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