Update duckdb index files

.gitattributes

@@ -53,3 +53,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.jpeg filter=lfs diff=lfs merge=lfs -text
 *.webp filter=lfs diff=lfs merge=lfs -text
 iwslt2017-de-en/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+iwslt2017-ar-en/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

iwslt2017-ar-en/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:9aa30b917b230c036af1769ff35a3938f8e620cb3114f1bd3ede6f28c5dcd189
+size 26750976