Update duckdb index files

.gitattributes

@@ -280,3 +280,4 @@ japanese/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 indonesian/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 japanese/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 japanese/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+kirundi/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

kirundi/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:db4285d78a4c05f4c00a3d908d9097942ab243d8531e35b04f57b9db86570884
+size 38809600