Update duckdb index files

.gitattributes

@@ -104,3 +104,4 @@ iwslt2017-ro-en/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-ro-it/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-ro-it/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-ro-it/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+iwslt2017-ro-nl/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

iwslt2017-ro-nl/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:184d93351ec02e516e288ebf8eea737c3b1bf2edd5aba66ccbca319c7c31a7f1
+size 22032384