Increase timeout for reline with --jit-wait

for failures like:
http://ci.rvm.jp/logfiles/brlog.trunk-mjit-wait.20201229-130509
http://ci.rvm.jp/logfiles/brlog.trunk-mjit-wait.20201229-165132
http://ci.rvm.jp/logfiles/brlog.trunk-mjit-wait.20201228-015519

test/reline/test_within_pipe.rb

@@ -8,6 +8,7 @@ class Reline::WithinPipeTest < Reline::TestCase
     @reader, @output_writer = IO.pipe((RELINE_TEST_ENCODING rescue Encoding.default_external))
     @output = Reline.output = @output_writer
     @config = Reline.send(:core).config
+    @config.keyseq_timeout *= 5 if defined?(RubyVM::MJIT) && RubyVM::MJIT.enabled? # for --jit-wait CI
     @line_editor = Reline.send(:core).line_editor
   end