Update duckdb index files

.gitattributes

@@ -66,3 +66,4 @@ qasper/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 qmsum/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 trec/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 passage_retrieval_en/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+vcsum/test/index.duckdb filter=lfs diff=lfs merge=lfs -text

vcsum/test/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:80d22d4f8957b09dff9077ab7578ed50b055a7535b93684216d7bc9daef7ec64
+size 4468736