Update duckdb index files

.gitattributes

@@ -62,3 +62,4 @@ default/dac_16k/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/dac_24k/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/dac_44k/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 sha256:707c71bfbc245009ecef9309c7dc964bddc2589fbc8cabcad65acd32d485f9fa
+size 524824576