Update duckdb index files

.gitattributes

@@ -91,3 +91,4 @@ cs_en/sampled_test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 en/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ar_ru/sampled_validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cs_ja/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+cs_it/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

cs_it/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:435ac496f13137d8113cad10aab712656ce4f8285ff494ecf5112c06366e3823
+size 330575872