Update duckdb index files

.gitattributes

@@ -57,3 +57,4 @@ VLyb--UMLS/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 VLyb--UMLS/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:efbd92c1b68b93dabe4225320485ba77d00e30294000a13ba2e95e918a4cbbc9
+size 1060864