Update duckdb index files

.gitattributes

@@ -86,3 +86,4 @@ ar_hi/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cs_it/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cs_ja/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cs_ja/sampled_validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+ar_ko/sampled_validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

ar_ko/sampled_validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:c2fc3b4aa0cf0abe25661830ef59a8db4b7084d0104257305c55ac6079cc111a
+size 23867392