Update duckdb index files

.gitattributes

@@ -57,3 +57,4 @@ d0rj--audiocaps/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 d0rj--audiocaps/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 d0rj--audiocaps/train/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:e760c5cc457b732eff55394343ba193d5df32193f05609cd61c4666bd44a0de6
+size 1323008