Update duckdb index files

.gitattributes

@@ -54,3 +54,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.webp filter=lfs diff=lfs merge=lfs -text
 train.jsonl filter=lfs diff=lfs merge=lfs -text
 artemkramov--coreference-dataset-ua/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+artemkramov--coreference-dataset-ua/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

artemkramov--coreference-dataset-ua/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:79c2faf61c28cb66c0929be64f33ce532cb46a5e806d35bce1adbf6c94d9ca70
+size 2371584