Update duckdb index files

.gitattributes

@@ -26,3 +26,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.zstandard filter=lfs diff=lfs merge=lfs -text
 *tfevents* filter=lfs diff=lfs merge=lfs -text
 et-en/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+et-en/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

et-en/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:5b81492c13a1170c458a79f3cb7a571e287235c376d0b30e5f67b91cf3b8d533
+size 1323008