Update duckdb index files

.gitattributes

@@ -102,3 +102,4 @@ cs/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 es_de/sampled_validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 es_ja/sampled_test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 fr/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+ar_de/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

ar_de/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:85efb917eb5fd3d5fe8ae33dcd19ebe4ae9fa4d42952465bff675540f3a5b6e8
+size 78655488