Update duckdb index files

.gitattributes

@@ -77,3 +77,4 @@ Italian[[:space:]](IT)/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 Italian[[:space:]](IT)/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 Italian[[:space:]](IT)/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 Multilingual[[:space:]](MULTI)/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+Multilingual[[:space:]](MULTI)/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

Multilingual (MULTI)/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:79b8b63523ad11eee3d8151da31014be2a545a27d69a6ee18bd2f7f7f5121b2b
+size 2633728