Update duckdb index files

.gitattributes

@@ -2,3 +2,4 @@ Age_Comparison/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 Age_Comparison/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 Always_Never/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 Always_Never/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+Antonym_Negation/test/index.duckdb filter=lfs diff=lfs merge=lfs -text

Antonym_Negation/test/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:92dd49abc569a6c70f1f7fda40bd432edbcee9198eea486e16a98e3c0041ff8c
+size 1060864