Update duckdb index files

.gitattributes

@@ -6,3 +6,4 @@ allenai--mup-full/train/0000.parquet filter=lfs diff=lfs merge=lfs -text
 allenai--mup-full/validation/0000.parquet filter=lfs diff=lfs merge=lfs -text
 default/train/0000.parquet filter=lfs diff=lfs merge=lfs -text
 default/validation/0000.parquet 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 sha256:181beac93212065a62eac9f436ae41e9eb391660fa33f36d6e2e572ed675dece
+size 90714112