Update duckdb index files

.gitattributes

@@ -282,3 +282,4 @@ 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/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+kirundi/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

kirundi/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:6f1f0b9eee6288127d4b37cfa63650519b25bd9a505f7dcf2132eeaaa88f4e0b
+size 4993024