Update duckdb index files

.gitattributes

@@ -72,3 +72,4 @@ paws_x/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 python_state_changes/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 tatoeba_mt/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 tnews/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+neural_code_search/test/index.duckdb filter=lfs diff=lfs merge=lfs -text

neural_code_search/test/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:2aae252d54f87759b5ac4b322e17ae8672fb9725cea3f15d0fd43fddbab530c1
+size 1060864