Fix CI

Author: H-G-Hristov

libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/unique.deprecated_in_cxx17.verify.cpp

@@ -17,6 +17,7 @@
 // bool unique() const; // deprecated in C++17, removed in C++20
 
 #include <memory>
+#include <tuple>
 
 void f() {
   const std::shared_ptr<int> p;