Update duckdb index files

.gitattributes

@@ -62,3 +62,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 7/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 9/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 8/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+optdigits/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

optdigits/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:fbdbf0af0211937f800b3d79c2a62b90415fa139524d1ab17cc48ad068d6a4d8
+size 1060864