Upgrade code from 146 to new standards

src/Bundle/ChillPersonBundle/Entity/Person.php

@@ -619,7 +619,7 @@ class Person implements HasCenterInterface, TrackCreationInterface, TrackUpdateI
      * @return true | array True if the accompanying periods are not collapsing,
      * an array with data for displaying the error
      */
-    public function checkAccompanyingPeriodsAreNotCollapsing(): bool|array
+    public function checkAccompanyingPeriodsAreNotCollapsing(): array|bool
     {
         $periods = $this->getAccompanyingPeriodsOrdered();
         $periodsNbr = count($periods);