Add missing import

Author: knutwalker

cypher-aggregation/src/main/java/org/neo4j/gds/projection/CypherAggregation.java

@@ -55,6 +55,7 @@
 import org.neo4j.gds.core.loading.construction.GraphFactory;
 import org.neo4j.gds.core.loading.construction.NodeLabelToken;
 import org.neo4j.gds.core.loading.construction.NodeLabelTokens;
+import org.neo4j.gds.core.loading.construction.PropertyValues;
 import org.neo4j.gds.core.loading.construction.RelationshipsBuilder;
 import org.neo4j.gds.core.utils.ProgressTimer;
 import org.neo4j.graphdb.GraphDatabaseService;