Update duckdb index files

.gitattributes

@@ -251,3 +251,4 @@ dpr-first-30%-maxlen-500/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 dpr-first-45%-maxlen-300/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 dpr-first-45%-maxlen-300/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 dpr-first-45%-maxlen-300/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+dpr-first-45%-maxlen-500/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

dpr-first-45%-maxlen-500/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:46fbca7b763efd350f8673403fde75204bcc8e6d85c9177b64a8bba52253a7b4
+size 8400896