Update duckdb index files

.gitattributes

@@ -365,3 +365,4 @@ yoruba/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 pidgin/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 hindi/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 persian/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+russian/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

russian/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:2f6a93463d6419d41563fcf18c08678edc1c061769e5c228d11252dbe8ea3e95
+size 233844736