Update duckdb index files

.gitattributes

@@ -68,3 +68,4 @@ fr/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 fr/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 it/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 it/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+it/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

it/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:48982e498272a18dbd9f2ff80a9c5af3188d4e057de7b5beab9e2a647fc74f41
+size 1323008