Update duckdb index files

.gitattributes

@@ -53,3 +53,4 @@ Gabriel--xsum_swe/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 Gabriel--xsum_swe/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 Gabriel--xsum_swe/train/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 sha256:050f7d78b2285a3bea862ca3ec8963c216e03f6625576a998d44ac351b9d2f2b
+size 68956160