Update duckdb index files

.gitattributes

@@ -90,3 +90,4 @@ iwslt2017-ko-en/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-ko-en/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-ko-en/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-nl-en/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+iwslt2017-nl-en/test/index.duckdb filter=lfs diff=lfs merge=lfs -text

iwslt2017-nl-en/test/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:629164bd08ad9af7ff3c529edaeed8355a185f0b9751ebe9af0a3d3b3ee65cda
+size 1323008