Update duckdb index files

.gitattributes

@@ -87,3 +87,4 @@ default/encodec_24k_3bps/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_en_libritts_16k_gr1nq32ds320/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/encodec_24k_6bps/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/encodec_24k_6bps/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:92648861aad80f30cca836cfe01fbc779837cb967425721943bd86ee11ef8175
+size 1578643456