Update duckdb index files

.gitattributes

@@ -55,3 +55,4 @@ saved_model/**/* 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/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+iwslt2017-ar-en/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

iwslt2017-ar-en/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:cb24a3b19a01e585a1617b9ff8419e83a50cbe056b4b0438bd497aa1245d20ed
+size 1060864