Update duckdb index files

.gitattributes

@@ -3,3 +3,4 @@ ru/web_nlg-train.parquet filter=lfs diff=lfs merge=lfs -text
 ru/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ru/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ru/challenge_test_scramble/index.duckdb filter=lfs diff=lfs merge=lfs -text
+ru/challenge_validation_sample/index.duckdb filter=lfs diff=lfs merge=lfs -text

ru/challenge_validation_sample/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:15647a693d1606baaddf7a68377168c140c0c3e5fd561dfd654d4176aa035795
+size 1323008