Update duckdb index files

.gitattributes

@@ -61,3 +61,4 @@ 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 sha256:147b5514f59b1a78ea9b8f51233c350d27be9fa705d6082e7e86495c77d556ae
+size 18362368