Update duckdb index files

.gitattributes

@@ -66,3 +66,4 @@ ibo/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ibo/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 kin/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 kin/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+kin/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

kin/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:cd3673030b6d57a4704cca8006b0f9db66da481266a1aa7779e6079991ce0d4f
+size 1060864