Update duckdb index files

.gitattributes

@@ -56,3 +56,4 @@ test.parquet filter=lfs diff=lfs merge=lfs -text
 train.parquet filter=lfs diff=lfs merge=lfs -text
 validation.parquet filter=lfs diff=lfs merge=lfs -text
 pszemraj--scientific_lay_summarisation-plos-norm/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+pszemraj--scientific_lay_summarisation-plos-norm/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

pszemraj--scientific_lay_summarisation-plos-norm/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:44a8659402106b462bda7e51d2dfa4c59c43cbd70bd46cd8368dc5cde8d82cdb
+size 51916800