Update duckdb index files

.gitattributes

@@ -58,3 +58,4 @@ default/academicodec_hifi_16k_320d_large_uni/index.duckdb filter=lfs diff=lfs me
 default/academicodec_hifi_24k_320d/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/audiodec_24k_320d/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_1_5bps/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/encodec_24k_1_5bps/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:9adc965f91093694c0d6b2f0a1c6c5eda1d36edcc63ab0323d3a965c10e38f6d
+size 3158016