Update duckdb index files

.gitattributes

@@ -249,3 +249,4 @@ ja_cs/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ja_ar/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ar_zh/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ar_nl/sampled_test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+ar_nl/sampled_validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

ar_nl/sampled_validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:4de1a1af97a065ddd075b5f38929836750da28623de4728917df2717856c79aa
+size 58470400