Update duckdb index files

.gitattributes

@@ -56,3 +56,4 @@ Rosenberg--CMeIE/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 Rosenberg--CMeIE/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/test/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:d55ec1619c708dd1c1a30d40e4b16f075975173d03a0eb59b02ad8726abcd89b
+size 2371584