Update duckdb index files

.gitattributes

@@ -1,3 +1,4 @@
 umnsrs_relatedness_mod_source/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 umnsrs_relatedness_source/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 umnsrs_similarity_bigbio_pairs/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+umnsrs_similarity_mod_bigbio_pairs/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

umnsrs_similarity_mod_bigbio_pairs/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:7a1326e7036323747f7a6e98937233968b234112070d21518b4c15889b346348
+size 1060864