Update duckdb index files

.gitattributes

@@ -72,3 +72,4 @@ paq.original-split/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 triviaqa.random-split/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 triviaqa.random-split/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 naturalquestions.random-split/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+naturalquestions.random-split/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

naturalquestions.random-split/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:59a78ef34d8ff5ea70281a03ef1bdb4186da9dc28548696fae388aa4eee7d402
+size 14692352