Update duckdb index files

.gitattributes

@@ -67,3 +67,4 @@ default/encodec_24k_24bps/partial-index.duckdb filter=lfs diff=lfs merge=lfs -te
 default/funcodec_en_libritts_16k_gr1nq32ds320/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_gr8nq32ds320/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 sha256:209e0ee7e4a2cc50283db1a32825bdb3f7911fc05b63de34a9177d536fe06f55
+size 3157274624