feat: add Laravel 11/12 and PHP 8.3+ support

- Widen illuminate/* deps to ^10.0|^11.0|^12.0, require PHP ^8.3
- Upgrade PHPUnit to ^10.5|^11.0, Mockery to ^1.6
- Rewrite phpunit.xml.dist for PHPUnit 10+ format (source/include
  replaces filter/whitelist, removed deprecated attributes)
- Replace $dates with $casts on Token model
- Implement DeferrableProvider interface instead of $defer property
  on ClientServiceProvider
- Use FQCN route definitions instead of string-based namespace()
- Fix migration getColumnType() check for Laravel 11+ native types
- Replace @test doc annotations with #[Test] attributes
- Fix dynamic property deprecation in ControllerTest

tests/Http/Middleware/FilterTest.php

@@ -8,6 +8,7 @@
 use Illuminate\Routing\Redirector;
 use Mockery;
 use Mockery\Mock;
+use PHPUnit\Framework\Attributes\Test;
 use Wearepixel\QuickBooks\Client as QuickBooks;
 use Wearepixel\QuickBooks\TestCase;
 
@@ -62,17 +63,13 @@ protected function setUp(): void
         );
     }
 
-    /**
-     * @test
-     */
+    #[Test]
     public function it_can_be_constructed()
     {
         $this->assertInstanceOf(Filter::class, $this->filter);
     }
 
-    /**
-     * @test
-     */
+    #[Test]
     public function it_just_passes_the_request_to_the_next_middleware_if_account_linked_to_quickbooks()
     {
         $next_middleware = function ($request) {
@@ -88,9 +85,7 @@ public function it_just_passes_the_request_to_the_next_middleware_if_account_lin
         $this->filter->handle($this->request_mock, $next_middleware);
     }
 
-    /**
-     * @test
-     */
+    #[Test]
     public function it_redirects_to_quickbooks_connect_route_after_setting_intended_session_if_account_not_linked()
     {
         $this->request_mock