Update duckdb index files

.gitattributes

@@ -68,3 +68,4 @@ 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/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 sha256:7ab408e934a1d2e8c2b89c222631e97bd1ce3998251f9c3b28da33c01c95b240
+size 18886656