Update duckdb index files

.gitattributes

@@ -40,3 +40,4 @@ validation.json filter=lfs diff=lfs merge=lfs -text
 test.json filter=lfs diff=lfs merge=lfs -text
 train.json filter=lfs diff=lfs merge=lfs -text
 raw/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+raw/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

raw/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:aa44088896e000cb7cc5779d105c32a05269731e5d5db3ea7e9bbecd00712fb0
+size 39596032