Update duckdb index files

.gitattributes

@@ -57,3 +57,4 @@ dkoterwa--kor-sts/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 dkoterwa--kor-sts/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 dkoterwa--kor-sts/valid/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:d21fca79f52fbd8da1d8362b07a87e7305ba3a060f1cbe8f63ebccddcab36776
+size 1847296