Update duckdb index files

.gitattributes

@@ -1076,3 +1076,4 @@ cs_zh/sampled_validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cs_zh/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cs_zh/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cs_zh/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+de_cs/sampled_test/index.duckdb filter=lfs diff=lfs merge=lfs -text

de_cs/sampled_test/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:478ac60cce8f6ac59f3d14fa0e613cf3af73fdc41f2d56f0ac58be95f3d9f558
+size 50606080