Update flink-connector-jdbc-postgres/src/test/java/org/apache/flink/connector/jdbc/postgres/database/catalog/PostgresCatalogITCase.java

Co-authored-by: Yuepeng Pan <[email protected]>

Author: och5351

flink-connector-jdbc-postgres/src/test/java/org/apache/flink/connector/jdbc/postgres/database/catalog/PostgresCatalogITCase.java

@@ -215,6 +215,6 @@ void testNullUuidTypes() {
                                 .collect());
         assertThat(results)
                 .hasToString(
-                        "[+I[1, NULL]]");
+                        "[+I[1, null]]");
     }
 }