Update duckdb index files

.gitattributes

@@ -3,3 +3,4 @@ olpa--jbo-corpus/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 olpa--jbo-corpus/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:f5785c2626897112621e5256d80d8593f1ced96b3efd103326faa8bcef4d77d9
+size 1323008