feat: add support for pgx/v5 emit_pointers_for_null_types flag (#2269)

Author: ludusrusso

internal/codegen/golang/postgresql_type.go

@@ -37,7 +37,7 @@ func postgresType(req *plugin.CodeGenRequest, col *plugin.Column) string {
 	columnType := sdk.DataType(col.Type)
 	notNull := col.NotNull || col.IsArray
 	driver := parseDriver(req.Settings.Go.SqlPackage)
-	emitPointersForNull := driver == SQLDriverPGXV4 && req.Settings.Go.EmitPointersForNullTypes
+	emitPointersForNull := driver.IsPGX() && req.Settings.Go.EmitPointersForNullTypes
 
 	switch columnType {
 	case "serial", "serial4", "pg_catalog.serial4":