Add missing includes

PiperOrigin-RevId: 546831261
Change-Id: Ida92134ac67c03b102c8004438c6d95c09dcbd39
diff --git a/support/internal/return_value_slot_test.cc b/support/internal/return_value_slot_test.cc
index 7b2a4bd..92393c5 100644
--- a/support/internal/return_value_slot_test.cc
+++ b/support/internal/return_value_slot_test.cc
@@ -4,6 +4,9 @@
 
 #include "support/internal/return_value_slot.h"
 
+#include <utility>
+#include <vector>
+
 #include "gmock/gmock.h"
 #include "gtest/gtest.h"
 #include "absl/log/check.h"