Update duckdb index files

.gitattributes

@@ -242,3 +242,4 @@ sk_contracts/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 sv_all/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 sk_wikipedia/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 sv_contracts/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+cs_caselaw/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

cs_caselaw/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:cbe349cb8b5d40fbea081200e9d4a895250720d2b9a671ade5be13b7c3ee9337
+size 6041600