Update duckdb index files

.gitattributes

@@ -1,3 +1,4 @@
 pbwt--public-data-tokenizer/parquet-train.parquet filter=lfs diff=lfs merge=lfs -text
 pbwt--public-data-tokenizer/parquet-validation.parquet filter=lfs diff=lfs merge=lfs -text
 pbwt--public-data-tokenizer/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+pbwt--public-data-tokenizer/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

pbwt--public-data-tokenizer/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:636be8123b17aa809e661e5db508e1f261119a446e04feeed36fffcfd077e9e3
+size 6041600