Update duckdb index files

.gitattributes

@@ -259,3 +259,4 @@ chinese_traditional/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 chinese_traditional/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 chinese_traditional/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 english/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+english/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

english/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:8c09e8600fc83cbfb9d8cc17ea90dd1381bf1b8a6a1834af234610ad4d8540a4
+size 64761856