Update duckdb index files

.gitattributes

@@ -1,3 +1,4 @@
 mteb--raw_biorxiv/json-train.parquet filter=lfs diff=lfs merge=lfs -text
 mteb--raw_biorxiv/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/train/0000.parquet filter=lfs diff=lfs merge=lfs -text
+default/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:d7f0d3f493ea0062b43ba1b4be00d665e271b6a04d96c043adceb25613271f34
+size 203436032