Update duckdb index files

.gitattributes

@@ -1,2 +1,3 @@
 c17hawke--stackoverflow-dataset/csv-train.parquet filter=lfs diff=lfs merge=lfs -text
 c17hawke--stackoverflow-dataset/csv-test.parquet filter=lfs diff=lfs merge=lfs -text
+c17hawke--stackoverflow-dataset/test/index.duckdb filter=lfs diff=lfs merge=lfs -text

c17hawke--stackoverflow-dataset/test/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:91b895c68680f651a3c78698d4571a083501f4ad16c87e2e4ee984c291766bb0
+size 18624512