Update duckdb index files

.gitattributes

@@ -67,3 +67,4 @@ fr/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 fr/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 fr/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 it/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+it/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

it/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:79abf97e59ab7954de873c5433cb93920d97050f7105e703a34f539348de2aed
+size 2633728