Update duckdb index files

.gitattributes

@@ -119,3 +119,4 @@ iwslt2017-ro-en/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-ko-en/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-zh-en/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-zh-en/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+iwslt2017-ro-nl/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

iwslt2017-ro-nl/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:aa473fdd6621f863161fd981ea4574dd02075d7104c67e5f486e4c2d7a4656dd
+size 1060864