Update duckdb index files

.gitattributes

@@ -5,3 +5,4 @@ irenepap--qasper/train/0000.parquet filter=lfs diff=lfs merge=lfs -text
 irenepap--qasper/dev/0000.parquet filter=lfs diff=lfs merge=lfs -text
 default/train/0000.parquet filter=lfs diff=lfs merge=lfs -text
 default/dev/0000.parquet 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:f7d88882d78a7d6c8da6501c80edb1cd1af626ae4d7fc9e9577e636b34dad536
+size 3682304