Update duckdb index files

.gitattributes

@@ -58,3 +58,4 @@ VLyb--FB15k/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 VLyb--FB15k/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 sha256:407479c4961c77c4cfd01b0e8f8f50616322516f27461089ce08b1cc7b279808
+size 4468736