Update duckdb index files

.gitattributes

@@ -70,3 +70,4 @@ default/funcodec_zh_en_16k_nq32ds320/index.duckdb filter=lfs diff=lfs merge=lfs
 default/speech_tokenizer_16k/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/encodec_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/encodec_24k_12bps/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/encodec_24k_12bps/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:9171bea4e5479cb36dd36f7aec1bbe3bf8ad2cbbe4a48436065c7b314ec2abef
+size 1110716416