Update duckdb index files

.gitattributes

@@ -134,3 +134,4 @@ 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/opensource.stackexchange.com/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/opensource.stackexchange.com/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:9288ed4d39fabbdec7ea25b66abc1ca5df5bd554e9a7a8eb10deeb0546d125b5
+size 1585152