Update duckdb index files

.gitattributes

@@ -1,2 +1,3 @@
 AlekseyKorshuk--dalio-book-handwritten-io-sorted/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 AlekseyKorshuk--dalio-book-handwritten-io-sorted/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+AlekseyKorshuk--dalio-book-handwritten-io-sorted/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

AlekseyKorshuk--dalio-book-handwritten-io-sorted/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:f1f37b1db1f575480d003bc080d4e8736d045dc8e5086ed423e306d0ec8897d5
+size 1323008