Fix conflict with getAttributes() returned type

docker-compose.yml

@@ -34,6 +34,11 @@ services:
             - ./conf-dev/obs_cat.sql:/sql/obs_cat.sql
             - ./conf-dev/observations_info.sql:/sql/observations_info.sql
             - ./conf-dev/init-postgres.sh:/docker-entrypoint-initdb.d/init-postgres.sh
+    
+    adminer:
+        image: adminer
+        ports:
+            - 8083:8080
 
 volumes:
     pgdata:
\ No newline at end of file

src/Entity/Dataset.php

@@ -12,7 +12,7 @@ declare(strict_types=1);
 
 namespace App\Entity;
 
-use Doctrine\Common\Collections\ArrayCollection;
+// use Doctrine\Common\Collections\Pers;
 
 /**
  * @Entity
@@ -218,7 +218,7 @@ class Dataset implements \JsonSerializable
         $this->datasetFamily = $datasetFamily;
     }
 
-    public function getAttributes(): ArrayCollection
+    public function getAttributes()
     {
         return $this->attributes;
     }