Update duckdb index files

.gitattributes

@@ -56,3 +56,4 @@ priors-prediction/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 two-years-recidividity/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 encoding/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 priors-prediction-no-race/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+race/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

race/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:a1f1e61de93b658a26a825f39f582e923c8823ed3db030c94a2a5baab383910b
+size 1060864