Update duckdb index files

.gitattributes

@@ -4,3 +4,4 @@ shwet--BBC_NEWS/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 shwet--BBC_NEWS/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/train/0000.parquet filter=lfs diff=lfs merge=lfs -text
 default/validation/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 sha256:4039965562bc5a328634470809276f3308b49e3242dec8fb4082b888562d646f
+size 15216640