Update duckdb index files

.gitattributes

@@ -53,3 +53,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.jpeg filter=lfs diff=lfs merge=lfs -text
 *.webp filter=lfs diff=lfs merge=lfs -text
 stacked-summaries--stacked-xsum/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+stacked-summaries--stacked-xsum/test/index.duckdb filter=lfs diff=lfs merge=lfs -text

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

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:989602a9561f5dc6274d9c889b65919384e46d84ec72faceb5659336ab458879
+size 892874752