Use secure TLS/SSL versions:

TLS1.2 can be used instead, it is available in all currently
supported versions of OpenSSL.

Signed-off-by: Damian Jarek <damian.jarek93@gmail.com>

test/beast/websocket/ssl.cpp

@@ -31,7 +31,7 @@ public:
     testTeardown()
     {
         net::io_context ioc;
-        net::ssl::context ctx(net::ssl::context::sslv23);
+        net::ssl::context ctx(net::ssl::context::tlsv12);
         Socket ss(ioc, ctx);
 
         struct handler