Update duckdb index files

.gitattributes

@@ -64,3 +64,4 @@ 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
 es/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+ro/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

ro/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:9fbccc520277eab44c16699a35285a6e00af3ceaf09ebcb3957a81ac1dcd7b23
+size 3713282048