Update duckdb index files

.gitattributes

@@ -283,3 +283,4 @@ japanese/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 kirundi/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 kirundi/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 kirundi/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+korean/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

korean/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:a4fe5c46f1916dae5d22b99615cf7aac147ef4c9d8315e682586a7b8e8b7cc12
+size 17051648