Update duckdb index files

.gitattributes

@@ -242,3 +242,4 @@ amharic/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 amharic/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 arabic/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 arabic/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+arabic/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

arabic/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:eb7d5968990cb9539e2046c9015268239e4afd3de580397610a910e215c79fcd
+size 18886656