Update duckdb index files

.gitattributes

@@ -1078,3 +1078,4 @@ 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_validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+de_cs/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

de_cs/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:f6bf61da9880f81ad9f2b52e34c39b39e1d54f3d2ca119c3e56499bc0a156faa
+size 393490432