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/HasQuickBooksTokenTest.php

@@ -2,6 +2,7 @@
 
 namespace Wearepixel\QuickBooks;
 
+use PHPUnit\Framework\Attributes\Test;
 use Wearepixel\QuickBooks\Stubs\User;
 
 /**
@@ -18,21 +19,17 @@ protected function setUp(): void
     {
         parent::setUp();
 
-        $this->user = new User();
+        $this->user = new User;
     }
 
-    /**
-     * @test
-     */
+    #[Test]
     public function it_can_be_constructed()
     {
         $this->assertInstanceOf(User::class, $this->user);
     }
 
-    /**
-     * @test
-     */
-    public function it_has_a_hasOne_relationship_to_token()
+    #[Test]
+    public function it_has_a_has_one_relationship_to_token()
     {
         $this->assertInstanceOf(Token::class, $this->user->quickBooksToken()->getModel());
     }