Add support for building against Qt 6

Source/Core/DolphinQt/QtUtils/ParallelProgressDialog.h

@@ -16,6 +16,11 @@ class ParallelProgressDialog final : public QObject
   Q_OBJECT
 
 public:
+  ParallelProgressDialog(const ParallelProgressDialog&) = delete;
+  ParallelProgressDialog& operator=(const ParallelProgressDialog&) = delete;
+  ParallelProgressDialog(ParallelProgressDialog&&) = delete;
+  ParallelProgressDialog& operator=(ParallelProgressDialog&&) = delete;
+
   // Only use this from the main thread
   template <typename... Args>
   ParallelProgressDialog(Args&&... args) : m_dialog{std::forward<Args>(args)...}