Update duckdb index files

.gitattributes

@@ -14,3 +14,4 @@ qqp/glue-ci-test.parquet filter=lfs diff=lfs merge=lfs -text
 sst2/glue-ci-train.parquet filter=lfs diff=lfs merge=lfs -text
 ax/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cola/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+cola/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

cola/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:fc740c84b7777b652e0ac7fb16c056b48ee405bd8dac7da0a947997b99f7ea00
+size 1323008