fix Qt6 deprecation warnings

Source/Core/DolphinQt/Settings/AdvancedPane.cpp

@@ -12,6 +12,7 @@
 #include <QLabel>
 #include <QRadioButton>
 #include <QSignalBlocker>
+#include <QTimeZone>
 #include <QVBoxLayout>
 #include <cmath>
 
@@ -251,9 +252,18 @@ void AdvancedPane::CreateLayout()
       QStringLiteral("mm"), QStringLiteral("mm:ss")));
 
   QtUtils::ShowFourDigitYear(m_custom_rtc_datetime);
+#if QT_VERSION >= QT_VERSION_CHECK(6, 5, 0)
+  m_custom_rtc_datetime->setDateTimeRange(QDateTime({2000, 1, 1}, {0, 0, 0}, QTimeZone::UTC),
+                                          QDateTime({2099, 12, 31}, {23, 59, 59}, QTimeZone::UTC));
+#else
   m_custom_rtc_datetime->setDateTimeRange(QDateTime({2000, 1, 1}, {0, 0, 0}, Qt::UTC),
                                           QDateTime({2099, 12, 31}, {23, 59, 59}, Qt::UTC));
+#endif
+#if QT_VERSION >= QT_VERSION_CHECK(6, 7, 0)
+  m_custom_rtc_datetime->setTimeZone(QTimeZone::UTC);
+#else
   m_custom_rtc_datetime->setTimeSpec(Qt::UTC);
+#endif
   rtc_options->layout()->addWidget(m_custom_rtc_datetime);
 
   m_custom_rtc_checkbox->SetDescription(

Source/Core/DolphinQt/Settings/GameCubePane.cpp

@@ -241,7 +241,11 @@ void GameCubePane::CreateWidgets()
 void GameCubePane::ConnectWidgets()
 {
   // IPL Settings
+#if QT_VERSION >= QT_VERSION_CHECK(6, 7, 0)
+  connect(m_skip_main_menu, &QCheckBox::checkStateChanged, this, &GameCubePane::SaveSettings);
+#else
   connect(m_skip_main_menu, &QCheckBox::stateChanged, this, &GameCubePane::SaveSettings);
+#endif
   connect(m_language_combo, &QComboBox::currentIndexChanged, this, &GameCubePane::SaveSettings);
 
   // Device Settings
@@ -272,10 +276,20 @@ void GameCubePane::ConnectWidgets()
 
 #ifdef HAS_LIBMGBA
   // GBA Settings
+
+#if QT_VERSION >= QT_VERSION_CHECK(6, 7, 0)
+  connect(m_gba_threads, &QCheckBox::checkStateChanged, this, &GameCubePane::SaveSettings);
+#else
   connect(m_gba_threads, &QCheckBox::stateChanged, this, &GameCubePane::SaveSettings);
+#endif
   connect(m_gba_bios_edit, &QLineEdit::editingFinished, this, &GameCubePane::SaveSettings);
   connect(m_gba_browse_bios, &QPushButton::clicked, this, &GameCubePane::BrowseGBABios);
+#if QT_VERSION >= QT_VERSION_CHECK(6, 7, 0)
+  connect(m_gba_save_rom_path, &QCheckBox::checkStateChanged, this,
+          &GameCubePane::SaveRomPathChanged);
+#else
   connect(m_gba_save_rom_path, &QCheckBox::stateChanged, this, &GameCubePane::SaveRomPathChanged);
+#endif
   connect(m_gba_saves_edit, &QLineEdit::editingFinished, this, &GameCubePane::SaveSettings);
   connect(m_gba_browse_saves, &QPushButton::clicked, this, &GameCubePane::BrowseGBASaves);
   for (size_t i = 0; i < m_gba_browse_roms.size(); ++i)