TASK: Use constant instead of string

Co-authored-by: Christian Müller <[email protected]>

Neos.Neos/Classes/PendingChangesProjection/Change.php

@@ -87,7 +87,7 @@ public function updateToDatabase(Connection $databaseConnection, string $tableNa
                     'contentStreamId' => $this->contentStreamId->value,
                     'nodeAggregateId' => $this->nodeAggregateId->value,
                     'originDimensionSpacePoint' => $this->originDimensionSpacePoint?->toJson(),
-                    'originDimensionSpacePointHash' => $this->originDimensionSpacePoint?->hash ?: 'AGGREGATE',
+                    'originDimensionSpacePointHash' => $this->originDimensionSpacePoint?->hash ?: self::AGGREGATE_DIMENSIONSPACEPOINT_HASH_PLACEHOLDER,
                 ]
             );
         } catch (DbalException $e) {