SettingsDialog: Fix Qt 6.7 checkbox signal deprecations

qt/qtbase@3512fb1 deprecated the
stateChanged signal of QCheckBoxes in favor of a new checkStateChanged
signal. The signals are the same, except that now the enum type is
passed explicitly (before the enum was passed as an argument but defined
as an int).

src/forms/SettingsDialog.cpp

@@ -56,8 +56,13 @@ SettingsDialog::SettingsDialog(QWidget *parent)
 
 	connect(sessionTableTimer, &QTimer::timeout, this, &SettingsDialog::FillSessionTable);
 	connect(ui->buttonBox, &QDialogButtonBox::clicked, this, &SettingsDialog::DialogButtonClicked);
+#if QT_VERSION >= QT_VERSION_CHECK(6, 7, 0)
+	connect(ui->enableAuthenticationCheckBox, &QCheckBox::checkStateChanged, this,
+		&SettingsDialog::EnableAuthenticationCheckBoxChanged);
+#else
 	connect(ui->enableAuthenticationCheckBox, &QCheckBox::stateChanged, this,
 		&SettingsDialog::EnableAuthenticationCheckBoxChanged);
+#endif
 	connect(ui->generatePasswordButton, &QPushButton::clicked, this, &SettingsDialog::GeneratePasswordButtonClicked);
 	connect(ui->showConnectInfoButton, &QPushButton::clicked, this, &SettingsDialog::ShowConnectInfoButtonClicked);
 	connect(ui->serverPasswordLineEdit, &QLineEdit::textEdited, this, &SettingsDialog::PasswordEdited);