Update duckdb index files

.gitattributes

@@ -65,3 +65,4 @@ da_other/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 de_contracts/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 el_contracts/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cs_all/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+cs_contracts/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

cs_contracts/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:356bc4c3484f1215ca69f961e6e76fad43baa17cecae4d2b161eb8bda23f9798
+size 53751808