Update duckdb index files

.gitattributes

@@ -4,3 +4,4 @@ text_emotion/crowdflower-train.parquet filter=lfs diff=lfs merge=lfs -text
 airline-sentiment/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 corporate-messaging/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 economic-news/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+political-media-audience/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

political-media-audience/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:8f95c99808b356ebfca7c6c53f8919f05c76eb7095924fabcf35ff6896b77b9e
+size 3158016