Update duckdb index files

.gitattributes

@@ -62,3 +62,4 @@ nl/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 hu/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 it/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 nl/train/partial-index.duckdb filter=lfs diff=lfs merge=lfs -text
+cs/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

cs/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:59e9d17327f1abd8859f7d715053049ba26aa06860ac71a12fbf79d8c1016218
+size 3392417792