Update duckdb index files

.gitattributes

@@ -53,3 +53,4 @@ test.csv filter=lfs diff=lfs merge=lfs -text
 train.csv filter=lfs diff=lfs merge=lfs -text
 validation.csv filter=lfs diff=lfs merge=lfs -text
 g8a9--europarl_en-it/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+g8a9--europarl_en-it/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

g8a9--europarl_en-it/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:a17a898514e62dcb0f0fb9aeb97eca0564ed220e047fc55864a1c93c900dd7e6
+size 86257664