Update duckdb index files

.gitattributes

@@ -55,3 +55,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 train.csv filter=lfs diff=lfs merge=lfs -text
 validation.csv filter=lfs diff=lfs merge=lfs -text
 test.csv filter=lfs diff=lfs merge=lfs -text
+stacked-summaries--stacked-xsum-1024/test/index.duckdb filter=lfs diff=lfs merge=lfs -text

stacked-summaries--stacked-xsum-1024/test/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:1f17b75ed1e18ac545dca00c43b41afe0a1d5fbbf7e1237cde7e4ac2ac27818b
+size 106967040