Update duckdb index files

.gitattributes

@@ -55,3 +55,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 nayohan--boolq-ko/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 nayohan--boolq-ko/valid/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/valid/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/valid/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:9c5656f6b220eaa3035ce9088c6ef65bd310c144f668e676c818ea96764e87bc
+size 3682304