Update duckdb index files

.gitattributes

@@ -47,3 +47,4 @@ ar_it/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ar_en/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ar_it/sampled_validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ar_ko/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+ar_it/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

ar_it/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:b18b88fcad0c83bcc47c40bb3a9be96bde218c09f8f8ca19c95815f18a07b98c
+size 65810432