Update duckdb index files

.gitattributes

@@ -137,3 +137,4 @@ lv_contracts/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 pt_all/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 sl_caselaw/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 sk_other/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+sk_contracts/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

sk_contracts/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:5db5164d39f87add3157e523bdb7dfb950b32f9a26cadde9028fbfafbebe7f18
+size 64499712