Update duckdb index files

.gitattributes

@@ -63,3 +63,4 @@ or/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 st/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 tum/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 wo/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+bn/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

bn/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:9ce75c25ad0c5ddbf7930d9a2af6065339b05100bfc52e7635078c94b813d558
+size 708849664