use static call for static method

Author: Treggats

src/Relations/EmbedsMany.php

@@ -86,7 +86,7 @@ public function performUpdate(Model $model)
         // Get the correct foreign key value.
         $foreignKey = $this->getForeignKeyValue($model);
 
-        $values = $this->getUpdateValues($model->getDirty(), $this->localKey . '.$.');
+        $values = self::getUpdateValues($model->getDirty(), $this->localKey . '.$.');
 
         // Update document in database.
         $result = $this->toBase()->where($this->localKey . '.' . $model->getKeyName(), $foreignKey)

src/Relations/EmbedsOne.php

@@ -77,7 +77,7 @@ public function performUpdate(Model $model)
             return $this->parent->save();
         }
 
-        $values = $this->getUpdateValues($model->getDirty(), $this->localKey . '.');
+        $values = self::getUpdateValues($model->getDirty(), $this->localKey . '.');
 
         $result = $this->toBase()->update($values);