Update duckdb index files

.gitattributes

@@ -80,3 +80,4 @@ cs_de/sampled_validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cs_de/sampled_test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ar_fr/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cs_en/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+cs_it/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

cs_it/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:4e51ea294b44dc91d299ce41cd9fcff7a705c8f1fc3a9510246263f690535538
+size 50081792