Update duckdb index files

.gitattributes

@@ -84,3 +84,4 @@ ts/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ur/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 xh/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 yo/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+zu/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

zu/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:38d71c756d84428ece42064262a2c0c67bc111cff0e9ec69d62e39c8dc35ae9c
+size 380121088