Update duckdb index files

.gitattributes

@@ -52,3 +52,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.jpg filter=lfs diff=lfs merge=lfs -text
 *.jpeg filter=lfs diff=lfs merge=lfs -text
 *.webp filter=lfs diff=lfs merge=lfs -text
+NeelNanda--c4-code-20k/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

NeelNanda--c4-code-20k/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:72e0117e2d1dd112af7d97d14a6ef180712d4adb0fdbc99c270925d547ec1778
+size 116666368