Update duckdb index files

.gitattributes

@@ -71,3 +71,4 @@ default/funcodec_en_libritts_16k_gr8nq32ds320/index.duckdb filter=lfs diff=lfs m
 default/dac_44k/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/dac_24k/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/encodec_24k_1_5bps/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 sha256:4b776a136a623c144a46ff32b9313b2e325ac47565b9453de47daf2b46ba84c0
+size 20459520