Update duckdb index files

.gitattributes

@@ -56,3 +56,4 @@ Muennighoff--babi/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 Muennighoff--babi/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 Muennighoff--babi/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:f54ff8697631e0f1a51aba38094410fbeae2e77f27e86532467577152219b0e6
+size 2109440