Fix ProcPreconditions import

Author: soerenreichardt

alpha/alpha-proc/src/main/java/org/neo4j/gds/cypher/DropCypherDbProc.java

@@ -23,9 +23,9 @@
 import org.neo4j.dbms.api.DatabaseManagementService;
 import org.neo4j.dbms.api.DatabaseNotFoundException;
 import org.neo4j.gds.BaseProc;
+import org.neo4j.gds.ProcPreconditions;
 import org.neo4j.gds.compat.GraphDatabaseApiProxy;
 import org.neo4j.gds.core.utils.ProgressTimer;
-import org.neo4j.gds.executor.ProcPreconditions;
 import org.neo4j.gds.storageengine.InMemoryDatabaseCreationCatalog;
 import org.neo4j.procedure.Description;
 import org.neo4j.procedure.Name;