Use default secure protocol list from Qt

In Qt 6.5, `QSsl::SecureProtocols` is the same as `QSsl::TlsV1_2OrLater`. And by using
`QSsl::SecureProtocols` we won't need to worry it being outdated since Qt will regularly adjust
it.
https://github.com/qt/qtbase/blob/v6.5.0/src/plugins/tls/openssl/qsslcontext_openssl.cpp#L425-L429

src/base/http/server.cpp

@@ -107,7 +107,6 @@ Server::Server(IRequestHandler *requestHandler, QObject *parent)
 
     m_sslConfig.setCiphers(safeCipherList());
     m_sslConfig.setPeerVerifyMode(QSslSocket::VerifyNone);
-    m_sslConfig.setProtocol(QSsl::TlsV1_2OrLater);
 
     auto *dropConnectionTimer = new QTimer(this);
     connect(dropConnectionTimer, &QTimer::timeout, this, &Server::dropTimedOutConnection);