Update duckdb index files

.gitattributes

@@ -107,3 +107,4 @@ 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/test/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 sha256:64ba2b56e1eb37fd4aae6a51353f429bb2dc752c4b2e74f2cf9781d33ca24306
+size 1060864