Update duckdb index files

.gitattributes

@@ -2,3 +2,4 @@ allegro--summarization-allegro-articles/csv-train.parquet filter=lfs diff=lfs me
 allegro--summarization-allegro-articles/csv-test.parquet filter=lfs diff=lfs merge=lfs -text
 allegro--summarization-allegro-articles/csv-validation.parquet filter=lfs diff=lfs merge=lfs -text
 allegro--summarization-allegro-articles/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+allegro--summarization-allegro-articles/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

allegro--summarization-allegro-articles/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:82cc71fbb6fb73e77d9942acb3715e9d7b8af1f6c43b3d872e71fd296c53c850
+size 49819648