Update duckdb index files

.gitattributes

@@ -74,3 +74,4 @@ humaneval-ts/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 humaneval-ts-keep/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 humaneval-ts-remove/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 humaneval-ts-transform/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+mbpp-cpp/test/index.duckdb filter=lfs diff=lfs merge=lfs -text

mbpp-cpp/test/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:6569eddd4b2cbeceab578d3449c811746b615364b22d4cf6bb08656f210430a4
+size 1585152