Update duckdb index files

.gitattributes

@@ -57,3 +57,4 @@ plain_text/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 taeshahn--ko-lima/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 taeshahn--ko-lima/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 plain/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+vicuna/test/index.duckdb filter=lfs diff=lfs merge=lfs -text

vicuna/test/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:a67782bf9d8b2dd1014301376a053633cfe0315e8deb81041d0d6f8b9f06860f
+size 1060864