Update duckdb index files

.gitattributes

@@ -3,3 +3,4 @@ shwet--BBC_NEWS/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 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/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:425436f9aae5a3967171e7a6b3dbd775482182baae865e58d13e18d0af695610
+size 1847296