Land rapid7#8188, Update client to use TLS1.2

Author: jmartin-tech

lib/msf/core/rpc/v10/client.rb

@@ -36,7 +36,7 @@ def initialize(info={})
       :port => 3790,
       :uri  => '/api/',
       :ssl  => true,
-      :ssl_version => 'TLS1',
+      :ssl_version => 'TLS1.2',
       :context     => {}
     }.merge(info)