Update duckdb index files

.gitattributes

@@ -56,3 +56,4 @@ test.json filter=lfs diff=lfs merge=lfs -text
 train.json filter=lfs diff=lfs merge=lfs -text
 valid.json filter=lfs diff=lfs merge=lfs -text
 memray--stackexchange/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+memray--stackexchange/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

memray--stackexchange/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:bee4ef2d73a08c5f01c009d2606eea5eaf1a159e33dfca112c2aa9b4bfe7981b
+size 65810432