Update duckdb index files

.gitattributes

@@ -71,3 +71,4 @@ it/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 it/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 de/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 de/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+de/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

de/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:796662791764388e1233b13f9f23d4208e0414c6ed37dffebee028e7bd7165f1
+size 1323008