Update duckdb index files

.gitattributes

@@ -92,3 +92,4 @@ 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/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+iwslt2017-nl-it/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

iwslt2017-nl-it/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:a6c7c435a1bb27fd981fbee456aabd45ac9f7327ea4d9a3bb60811c5070ff7ba
+size 22556672