Update duckdb index files

.gitattributes

@@ -75,3 +75,4 @@ msmarco-queries/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cqadupstack-english-qrels/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 arguana-corpus/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 quora-queries/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+cqadupstack-gaming-corpus/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

cqadupstack-gaming-corpus/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:cf5cc597f2ddbd62d573b9d11a5ae3f853e026f820a830894d373a7d8fa3fdd4
+size 234631168