Update duckdb index files

.gitattributes

@@ -5,3 +5,4 @@ umnsrs_similarity_mod_bigbio_pairs/train/index.duckdb filter=lfs diff=lfs merge=
 umnsrs_similarity_mod_source/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 umnsrs_similarity_source/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 umnsrs_relatedness_mod_bigbio_pairs/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+umnsrs_relatedness_bigbio_pairs/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

umnsrs_relatedness_bigbio_pairs/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:097d5152bd2e8f34eeee845f2e89e6dfbb50aa84fd1dabf22103a64df9b72dca
+size 1060864