DX: fix phpstan issues

src/Bundle/ChillThirdPartyBundle/DataFixtures/ORM/LoadThirdParty.php

@@ -66,22 +66,6 @@ class LoadThirdParty extends Fixture implements DependentFixtureInterface
         $manager->flush();
     }
 
-    private function createAddress(): ObjectSet
-    {
-        $loader = new NativeLoader();
-
-        return $loader->loadData([
-            Address::class => [
-                'address1' => [
-                    'name' => '<fr_FR:company()>',
-                    'telephone' => $this->phoneNumberUtil->getExampleNumber('FR'),
-                    'email' => '<email()>',
-                    'comment' => '<fr_FR:realTextBetween(10, 500)>',
-                ],
-            ],
-        ]);
-    }
-
     private function getCenters(): Iterator
     {
         $references = array_map(

src/Bundle/ChillThirdPartyBundle/Entity/ThirdParty.php

@@ -23,6 +23,7 @@ use DateTimeImmutable;
 use DateTimeInterface;
 use Doctrine\Common\Collections\ArrayCollection;
 use Doctrine\Common\Collections\Collection;
+use Doctrine\Common\Collections\ReadableCollection;
 use Doctrine\ORM\Mapping as ORM;
 use libphonenumber\PhoneNumber;
 use Symfony\Component\Serializer\Annotation\Context;
@@ -153,7 +154,7 @@ class ThirdParty implements TrackCreationInterface, TrackUpdateInterface
      * @ORM\OneToMany(targetEntity="Chill\ThirdPartyBundle\Entity\ThirdParty", mappedBy="parent",
      * cascade={"persist"}, orphanRemoval=true)
      *
-     * @var Collection|ThirdParty[]
+     * @var Collection<(int|string), ThirdParty>
      * @Assert\Valid(traverse=true)
      */
     private Collection $children;
@@ -400,7 +401,7 @@ class ThirdParty implements TrackCreationInterface, TrackUpdateInterface
     /**
      * Get the children where active = true.
      */
-    public function getActiveChildren(): Collection
+    public function getActiveChildren(): ReadableCollection
     {
         return $this->children->filter(static fn (ThirdParty $tp) => $tp->getActive());
     }