Update duckdb index files

.gitattributes

@@ -56,3 +56,4 @@ tasksource--MOH/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 tasksource--MOH/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 tasksource--MOH/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:17d3049fa4a86f0de2eb80959ce34f0f829ed99204cbaa7ac3cc2985520c8ce7
+size 1060864