Update duckdb index files

.gitattributes

@@ -60,3 +60,4 @@ rish16--MLe-SNLI/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 rish16--MLe-SNLI/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/test/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 sha256:48d220a8749d0399471333487d47346ad0778fa78da65441bdab86d20b4c308e
+size 17575936