Update duckdb index files

.gitattributes

@@ -57,3 +57,4 @@ Yuhthe--samsum/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 Yuhthe--samsum/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 Yuhthe--samsum/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/test/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:c2528bd8b8d3b711866be5aafcbc9a7a0308e55531185423f180b9baa013e8c8
+size 1323008