Update duckdb index files

.gitattributes

@@ -54,3 +54,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.webp filter=lfs diff=lfs merge=lfs -text
 arithmetic_1dc/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 arithmetic_2da/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+arithmetic_2dm/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

arithmetic_2dm/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:b7bd9aa29f26d61d07d477547d1af1d4d9f5d6819f5e8d123a022f556875dea1
+size 1323008