Update duckdb index files

.gitattributes

@@ -85,3 +85,4 @@ iwslt2017-it-nl/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-fr-en/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-en-nl/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-en-ro/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+iwslt2017-it-ro/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

iwslt2017-it-ro/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:8950def5165024ee6c4a300459bd6cf72ea9d761f64838c94804b88007adc043
+size 24129536