Update duckdb index files

.gitattributes

@@ -4,3 +4,4 @@ upos/hr500k-train.parquet filter=lfs diff=lfs merge=lfs -text
 ner/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ner/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ner/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+ud/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

ud/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:2b6e7f9bdaea158700f08d7fb10168d0b8b4a19e260e4fb3790127305912309d
+size 5517312