Ruby

Skip some timeout tests on s390x

They are too unstable on the machine.

  1) Failure:
TestRegexp#test_timeout_shorter_than_global [/home/chkbuild/chkbuild/tmp/build/20231018T230003Z/ruby/test/ruby/test_regexp.rb:1788]:
Expected |0.2 - 0.962938869| (0.7629388690000001) to be <= 0.15000000000000002.

https://rubyci.s3.amazonaws.com/s390x/ruby-master/log/20231018T230003Z.fail.html.gz

  1) Failure:
TestRegexp#test_timeout_longer_than_global [/home/chkbuild/chkbuild/tmp/build/20231017T140006Z/ruby/test/ruby/test_regexp.rb:1788]:
Expected |0.5 - 1.040696078| (0.5406960780000001) to be <= 0.375.

https://rubyci.s3.amazonaws.com/s390x/ruby-master/log/20231017T140006Z.fail.html.gz