Update duckdb index files

.gitattributes

@@ -67,3 +67,4 @@ iwslt2017-en-nl/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-en-nl/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-en-ro/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-en-ro/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+iwslt2017-en-ro/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

iwslt2017-en-ro/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:c8830b51fe2c7c4848c2e0bccf704b07fc8878292e254a1ddaadc6b8970259a5
+size 1060864