Update duckdb index files

.gitattributes

@@ -53,3 +53,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.jpg filter=lfs diff=lfs merge=lfs -text
 *.jpeg filter=lfs diff=lfs merge=lfs -text
 *.webp filter=lfs diff=lfs merge=lfs -text
+default/bigram_prefixes/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/bigram_prefixes/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:35c210d7c7929799db5d079ab6ca10058369cc198e6532235f7324d4d79dc1ed
+size 2109440