Update duckdb index files

.gitattributes

@@ -70,3 +70,4 @@ default/funcodec_en_libritts_16k_gr8nq32ds320/index.duckdb filter=lfs diff=lfs m
 default/funcodec_en_libritts_16k_nq32ds640/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_zh_en_16k_nq32ds320/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/funcodec_zh_en_16k_nq32ds640/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/funcodec_zh_en_16k_nq32ds640/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:d6a8e1ae6fe6ed48d9be8cdea84c6bd99f7afd617de3ec57aea3c2cec496e7e1
+size 75509760