Update duckdb index files

.gitattributes

@@ -40,3 +40,4 @@ Java-apache-2.0/partial-train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 JavaScript-all/partial-train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 Python-all/partial-train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 all-all/partial-train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+C-gpl-2.0/partial-train/index.duckdb filter=lfs diff=lfs merge=lfs -text

C-gpl-2.0/partial-train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:0f709161d39051d18af3f2e2b7bfa5cdd67c2f4e01325df858c7b9758d5718a1
+size 5450248192