Update duckdb index files

.gitattributes

@@ -69,3 +69,4 @@ default/funcodec_en_libritts_16k_gr1nq32ds320/index.duckdb filter=lfs diff=lfs m
 default/funcodec_en_libritts_16k_gr8nq32ds320/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/original/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/funcodec_en_libritts_16k_nq32ds320/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/funcodec_en_libritts_16k_nq32ds640/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/funcodec_en_libritts_16k_nq32ds640/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:537428e96366aa2724f0588440432b1fac46f0bab553e879000d78f6fc8b6b5d
+size 2249207808