Update duckdb index files

.gitattributes

@@ -321,3 +321,4 @@ bg_other/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cs_caselaw/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 all_wikipedia/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 bg_contracts/train/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 sha256:66b400bee3dcfa75620f005de58ef8cf3d7b14c3c9474e3c0fdbd7b1086c3082
+size 35139584