bug #1371 fix: use concrete class (instead of anon) for test (kbond)

This PR was merged into the 2.x branch.

Discussion
----------

fix: use concrete class (instead of anon) for test

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| Issues        | #1369
| License       | MIT

`symfony/property-accessor` doesn't appear to parse object types from anon class props when imported. This is a quick fix to get the CI passing.

Commits
-------

e9046f2 fix: use concrete class (instead of anon) for test

src/LiveComponent/tests/Integration/LiveComponentHydratorTest.php

@@ -750,11 +750,7 @@ public function onEntireEntityUpdated($oldValue)
             $prod2 = new ProductFixtureEntity();
             $prod3 = create(ProductFixtureEntity::class, ['name' => 'item3'])->object();
 
-            return HydrationTest::create(new class() {
-                #[LiveProp()]
-                /** @var \Symfony\UX\LiveComponent\Tests\Fixtures\Entity\ProductFixtureEntity[] */
-                public array $products = [];
-            })
+            return HydrationTest::create(new DummyObjectWithObjects())
                 ->mountWith(['products' => [$prod1, $prod2, $prod3]])
                 ->assertDehydratesTo([
                     'products' => [$prod1->id, [], $prod3->id],
@@ -1643,3 +1639,10 @@ public function __construct(
     ) {
     }
 }
+
+class DummyObjectWithObjects
+{
+    #[LiveProp()]
+    /** @var ProductFixtureEntity[] */
+    public array $products = [];
+}