Do not break during import on openingHours presence

The objects might have an openingHours property.
This would break as our internal name would match during symfony
serialization.

We now use the expected property name.

Classes/Domain/Import/Entity/Place.php

@@ -51,7 +51,7 @@ class Place extends Base
     /**
      * @var OpeningHour[]
      */
-    protected $openingHours = [];
+    protected $openingHoursSpecifications = [];
 
     /**
      * @var OpeningHour[]
@@ -160,7 +160,7 @@ class Place extends Base
     {
         return GeneralUtility::makeInstance(DateBasedFilter::class)
             ->filterOutPreviousDates(
-                $this->openingHours,
+                $this->openingHoursSpecifications,
                 function (OpeningHour $hour): ?\DateTimeImmutable {
                     return $hour->getValidThrough();
                 }
@@ -210,7 +210,7 @@ class Place extends Base
      */
     public function addOpeningHoursSpecification(OpeningHour $openingHour): void
     {
-        $this->openingHours[] = $openingHour;
+        $this->openingHoursSpecifications[] = $openingHour;
     }
 
     /**