Update duckdb index files

.gitattributes

@@ -13,3 +13,4 @@ unknown_x4/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 realistic_mild_x4/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 realistic_mild_x4/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 bicubic_x2/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+bicubic_x2/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

bicubic_x2/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:6070191136e0e1cccca43d6e3edd4c6f2478b2a043294b0262f3486dc4cc0c3f
+size 1060864