Disable TLS 1.3 with Mbed TLS

src/impl/tlstransport.cpp

@@ -336,6 +336,7 @@ TlsTransport::TlsTransport(variant<shared_ptr<TcpTransport>, shared_ptr<HttpProx
 		    &mConf, mIsClient ? MBEDTLS_SSL_IS_CLIENT : MBEDTLS_SSL_IS_SERVER,
 		    MBEDTLS_SSL_TRANSPORT_STREAM, MBEDTLS_SSL_PRESET_DEFAULT));
 
+		mbedtls_ssl_conf_max_version(&mConf, MBEDTLS_SSL_MAJOR_VERSION_3, MBEDTLS_SSL_MINOR_VERSION_3); // TLS 1.2
 		mbedtls_ssl_conf_authmode(&mConf, MBEDTLS_SSL_VERIFY_OPTIONAL);
 		mbedtls_ssl_conf_rng(&mConf, mbedtls_ctr_drbg_random, &mDrbg);