Update duckdb index files

.gitattributes

@@ -56,3 +56,4 @@ lighteval--mutual/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 lighteval--mutual/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 lighteval--mutual/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 sha256:59203ba3d0621ca37815217021762772ca780421d72258cc344d41108bf1177b
+size 1847296