Update duckdb index files

.gitattributes

@@ -329,3 +329,4 @@ somali/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 somali/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 spanish/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 spanish/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+swahili/test/index.duckdb filter=lfs diff=lfs merge=lfs -text

swahili/test/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:de30b4dc2d20538ac9061996ceff1456a5b56c5e661ab49c8380ddaf20b1f5fa
+size 9449472