Update duckdb index files

.gitattributes

@@ -387,3 +387,4 @@ default/en.test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/bg.validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/es.train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/es.validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/eu.validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/eu.validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:3b2e054dc5464680d6bc8b59376b4f647b5cb9ddcfdb74884c9a8b52660d4d7a
+size 6041600