avoid deprecated method call

Author: zinal

src/main/java/tech/ydb/spark/connector/YdbAlterTable.java

@@ -145,7 +145,11 @@ private void applyProperty(String name, String value, PartitioningSettings ps) {
     CompletableFuture<Status> run(Session session) {
         final AlterTableSettings settings = new AlterTableSettings();
         for (YdbFieldInfo yfi : addColumns.values()) {
-            settings.addColumn(yfi.getName(), yfi.getType().toSdkType(yfi.isNullable()));
+            if (yfi.isNullable()) {
+                settings.addNullableColumn(yfi.getName(), yfi.getType().toSdkType(false));
+            } else {
+                settings.addNonnullColumn(yfi.getName(), yfi.getType().toSdkType(false));
+            }
         }
         for (String name : removeColumns) {
             settings.dropColumn(name);