Update duckdb index files

.gitattributes

@@ -45,3 +45,4 @@ it/validation/0000.parquet filter=lfs diff=lfs merge=lfs -text
 it/test/0000.parquet filter=lfs diff=lfs merge=lfs -text
 es/train/0000.parquet filter=lfs diff=lfs merge=lfs -text
 de/train/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:a5d0c702507bf666511f6c111a630988369644323619e0adc6f88cec51a106e5
+size 3158016