Update duckdb index files

.gitattributes

@@ -60,3 +60,4 @@ Chinese[[:space:]](ZH)/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 Chinese[[:space:]](ZH)/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 English[[:space:]](EN)/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 English[[:space:]](EN)/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+English[[:space:]](EN)/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

English (EN)/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:9c59a6392569f2689b2d1c5a9c1504ebaa770de4b327faec46e04d7e4c3e035f
+size 1060864