Update duckdb index files

.gitattributes

@@ -13,3 +13,4 @@ boolq/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cb/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cb/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cb/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+copa/test/index.duckdb filter=lfs diff=lfs merge=lfs -text

copa/test/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:113486e778e2bbd6985bb4c44c3fba05f32897c7a52c83bcb90d42dcca1929fc
+size 1060864