Update duckdb index files

.gitattributes

@@ -54,3 +54,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.jpeg filter=lfs diff=lfs merge=lfs -text
 *.webp filter=lfs diff=lfs merge=lfs -text
 livedoor-news-corpus/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+livedoor-news-corpus/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

livedoor-news-corpus/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:6a91be195f573e0f86155a5a9f94e364273853e4c2e8f9886b5595767ab79a48
+size 23867392