Update duckdb index files

.gitattributes

@@ -185,3 +185,4 @@ nl_other/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 pl_contracts/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 pt_contracts/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ro_contracts/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+en_contracts/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

en_contracts/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:1b0d865d9bbccfa99d3b46732e48ea221306d777d87af0c03772ac9e3c8e9eb6
+size 52441088