Add Informix equivalent of DuplicateKeyException code to ConnectionFactoryUtils

Signed-off-by: Lukáš Kvídera <[email protected]>

Author: sgflt

spring-r2dbc/src/main/java/org/springframework/r2dbc/connection/ConnectionFactoryUtils.java

@@ -76,7 +76,9 @@ public abstract class ConnectionFactoryUtils {
 			301,   // SAP HANA
 			1062,  // MySQL/MariaDB
 			2601,  // MS SQL Server
-			2627   // MS SQL Server
+			2627,  // MS SQL Server
+			-239,  // Informix
+			-268   // Informix
 		);