Update duckdb index files

.gitattributes

@@ -71,3 +71,4 @@ in_distribute_four_out_center_single/train/index.duckdb filter=lfs diff=lfs merg
 left_center_single_right_center_single/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 left_center_single_right_center_single/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 left_center_single_right_center_single/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+up_center_single_down_center_single/test/index.duckdb filter=lfs diff=lfs merge=lfs -text

up_center_single_down_center_single/test/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:1f6a42df84befc3beaf3a9f432fb883db7222be6ae8f7837e1a4a4b86a73afa9
+size 50343936