Update duckdb index files

.gitattributes

@@ -56,3 +56,4 @@ maximedb--sick_nl/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 maximedb--sick_nl/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 maximedb--sick_nl/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:a3fa6dd58416edaf1839a4491c2bf955511785ff650004f484530a32292dec71
+size 1060864