test/openssl/test_ssl: use TLS 1.2 for finished_messages on LibreSSL

LibreSSL 2.2.x has a bug in the Finished message handling with TLS 1.3. This is fixed by LibreSSL 3.3.2.

Author: rhenium

test/openssl/test_ssl.rb

@@ -486,6 +486,7 @@ def test_finished_messages
  }) { |port|
  ctx = OpenSSL::SSL::SSLContext.new
  ctx.verify_mode = OpenSSL::SSL::VERIFY_NONE
+ ctx.max_version = :TLS1_2 if libressl?(3, 2, 0) && !libressl?(3, 3, 0)
  server_connect(port, ctx) { |ssl|
  ssl.puts "abc"; ssl.gets