Update duckdb index files

.gitattributes

@@ -3,3 +3,4 @@ bhavana--MITRE/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 bhavana--MITRE/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 sha256:2a989568c112261f3f68dc73ae6888eec7c3d04c30ce17fad8f8b6f6c6a950df
+size 1323008