Update duckdb index files

.gitattributes

@@ -397,3 +397,4 @@ default/fr.test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/et.validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/fr.validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/fy_NL.train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/cs.validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/cs.validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:ba5ab873f6e9b44aa6d711813953b28f76b84e496d9a1c47fc6f393cdad49b39
+size 6041600