Update duckdb index files

.gitattributes

@@ -274,3 +274,4 @@ cs_id/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cs_id/sampled_test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cs_id/sampled_validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cs_id/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+cs_ko/sampled_test/index.duckdb filter=lfs diff=lfs merge=lfs -text

cs_ko/sampled_test/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:9c17a252fd9b6e2c0f8e2afa4181a3da5dcddeeefef02b9e2126c32121ad2699
+size 26750976