Update duckdb index files

.gitattributes

@@ -71,3 +71,4 @@ stanfordnlp--SHP/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 stanfordnlp--SHP/train/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 sha256:03e9baea65e593c6d051d097656b3fd30f3e1403b625ea345d527216536ae5e0
+size 65548288