Update duckdb index files

.gitattributes

@@ -56,3 +56,4 @@ ragarwal--NLI-Mix/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ragarwal--NLI-Mix/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ragarwal--NLI-Mix/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:f2752134625a3b01a3693ed633bf8d09b44759699d9c18d3f2685c026397e348
+size 53227520