upb: use the new reflection headers
Reflection headers now live in upb/reflection/ so update our include statements to
reflect this. (See what I did there?)
PiperOrigin-RevId: 474596615
diff --git a/python/repeated.h b/python/repeated.h
index 5d74bd2..8cd3872 100644
--- a/python/repeated.h
+++ b/python/repeated.h
@@ -31,7 +31,7 @@
#include <stdbool.h>
#include "python/python_api.h"
-#include "upb/def.h"
+#include "upb/reflection/def.h"
// Creates a new repeated field stub for field `f` of message object `parent`.
// Precondition: `parent` must be a stub.
