Update duckdb index files

.gitattributes

@@ -245,3 +245,4 @@ dpr-first-25%-maxlen-500/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 dpr-first-40%-maxlen-300/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 dpr-first-40%-maxlen-300/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 dpr-first-40%-maxlen-300/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+dpr-first-30%-maxlen-500/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

dpr-first-30%-maxlen-500/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:c7f30d5d2c8eabbd6be9ad1dd7de9012e6c86b7089b0fbb907e0bd3ce2abc021
+size 8400896