The initial problem was in server not starting encryption, because
its certificate was rejected by OpenSSL (v3) saying 'weak md'.
After the certificate was replaced, we got another problem - due
to the fixed TLS v.1 protocol for both client and server - handshake
is interrupted early with 'tls v1 alert' and error message
saying about not found signature algorithms. Don't fix the protocol
version, use proper QSsl::SecureProtocols (default).
Pick-to: 6.4 6.3 6.2 5.15
Task-number: QTBUG-106018
Task-number: QTBUG-95123
Change-Id: I0f22f5304f4405933ad511195bc61c640518e7d8
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
a7657d3c5f