Update duckdb index files

.gitattributes

@@ -104,3 +104,4 @@ default/askscience/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/bestof/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/tifu/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/changemyview/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/explainlikeimfive/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/explainlikeimfive/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:8c300d6463a95626b319ce2daf290740dfc42df4ced608c5f4852ef5dbc37db7
+size 948449280