Update duckdb index files

.gitattributes

@@ -57,3 +57,4 @@ charsiu--Common_voice_hidden_units/hubert.base.ls960.50/index.duckdb filter=lfs
 charsiu--Common_voice_hidden_units/hubert.base.ls960.100/index.duckdb filter=lfs diff=lfs merge=lfs -text
 charsiu--Common_voice_hidden_units/hubert.base.ls960.200/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/cpc.big.ll6k.100/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/cpc.big.ll6k.50/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/cpc.big.ll6k.50/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:80b713460f0e4595e5a3551787d076e42cc597cd1d23151c88ec7bda0fd8a57e
+size 130560000