Update duckdb index files

.gitattributes

@@ -10,3 +10,4 @@ pietrolesci--dnc/dev/0000.parquet filter=lfs diff=lfs merge=lfs -text
 default/train/0000.parquet filter=lfs diff=lfs merge=lfs -text
 default/test/0000.parquet filter=lfs diff=lfs merge=lfs -text
 default/dev/0000.parquet filter=lfs diff=lfs merge=lfs -text
+default/dev/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/dev/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:ae6a0aa93a219d6d5ac11951175311a61b0b4097967b5c711bfed46e14b48e6d
+size 11546624