Update duckdb index files

.gitattributes

@@ -1,2 +1,3 @@
 Moo--korean-parallel-corpora/csv-train.parquet filter=lfs diff=lfs merge=lfs -text
 Moo--korean-parallel-corpora/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+Moo--korean-parallel-corpora/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

Moo--korean-parallel-corpora/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:1d71ac0e07cb2461518451d68e417ee227332e4766e6a0e0c5707ba72b469733
+size 25964544