Update duckdb index files

.gitattributes

@@ -68,3 +68,4 @@ gu/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 hi/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ig/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 lg/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+nso/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

nso/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:eabbf5f798a6197abdcd9d2ad0224e7c6bbc54352a3990fdf48ed7f4db642ffb
+size 330838016