Update duckdb index files

.gitattributes

@@ -73,3 +73,4 @@ cs_all/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 de_all/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 de_other/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 da_caselaw/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 sha256:3feff07b04f824d097552288aa02dd8a68588cc9470127a10290567ab5342a47
+size 35139584