Update duckdb index files

.gitattributes

@@ -10,3 +10,4 @@ arbml--ANS_stance/test/0000.parquet filter=lfs diff=lfs merge=lfs -text
 default/train/0000.parquet filter=lfs diff=lfs merge=lfs -text
 default/validation/0000.parquet filter=lfs diff=lfs merge=lfs -text
 default/test/0000.parquet filter=lfs diff=lfs merge=lfs -text
+default/test/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/test/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:3c8ff1d2ed975b7bc6ddd4893a57d69df4f9ce84b5b104d15ce45a45aedc7e09
+size 1060864