Update duckdb index files

.gitattributes

@@ -133,3 +133,4 @@ default/meta.serverfault.com/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/meta.stackoverflow.com/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/meta.superuser.com/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/networkengineering.stackexchange.com/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/opendata.stackexchange.com/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/opendata.stackexchange.com/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:30f0a311db1999f6ade5fa21f8b2a621916a11185b7ce385fdbd098566c6d91b
+size 2371584