Update duckdb index files

.gitattributes

@@ -72,3 +72,4 @@ cs-mt/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cs-nl/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cs-pt/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cs-pl/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+cs-ro/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

cs-ro/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:e7d896b56fc2382162d7ae4b6bd0c17c54b28e3f8b89535959119928a9e2e6e8
+size 48246784