Update duckdb index files

.gitattributes

@@ -100,3 +100,4 @@ NaturalQuestions-corpus/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 Genomics-corpus/partial-test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 MIRACL-corpus/partial-test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 MSMARCO-corpus/partial-test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+ConditionalQA-corpus_coref/test/index.duckdb filter=lfs diff=lfs merge=lfs -text

ConditionalQA-corpus_coref/test/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:56fa1215d9a0224922a489614dba18ed0522b1f5c91f569ba914b755c25e4625
+size 8925184