Update duckdb index files

.gitattributes

@@ -68,3 +68,4 @@ default/funcodec_en_libritts_16k_gr8nq32ds320/index.duckdb filter=lfs diff=lfs m
 default/encodec_24k_3bps/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/encodec_24k_12bps/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 sha256:4786948aa95b2e9b2a619ed737d6fcbe1b31d02fda76015b0c2d14617906099a
+size 2371584