Update duckdb index files

.gitattributes

@@ -58,3 +58,4 @@ nfcorpus/evaluation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 paper_reviewer_matching/evaluation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 peer_review_score_hIndex/evaluation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 scidocs_mag_mesh/evaluation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+trec_covid/evaluation/index.duckdb filter=lfs diff=lfs merge=lfs -text

trec_covid/evaluation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:6b6c173e0a33839cfb4b939665a256ecaad3db0f62e574ab6203805889e2a676
+size 206843904