🔇 Silence ivar warnings in 2.7

Author: nevans

test/net/imap/fake_server/socket.rb

@@ -10,6 +10,8 @@ class Socket
     def initialize(tcp_socket, config:)
       @config     = config
       @tcp_socket = tcp_socket
+      @tls_socket = nil
+      @closed     = false
       use_tls if config.implicit_tls && tcp_socket
     end