Allow ruby-head to fail (#516) #249

Job	Run time
coverage (2.7, ubuntu-20.04)	48s
profile (2.7, native, ubuntu-20.04)	2m 21s
profile (2.7, pure, ubuntu-20.04)	2m 57s
test (2.2, ubuntu-20.04, Gemfile)	37s
test (2.3, ubuntu-20.04, Gemfile)	35s
test (2.4, ubuntu-20.04, Gemfile)	35s
test (2.5, ubuntu-20.04, Gemfile)	36s
test (2.6, ubuntu-20.04, Gemfile)	43s
test (2.7, ubuntu-20.04, Gemfile)	48s
test (3.0, ubuntu-20.04, Gemfile)	25s
test (3.1, ubuntu-20.04, Gemfile)	29s
test (3.2, ubuntu-20.04, Gemfile)	19s
test (jruby-9.1, ubuntu-20.04, Gemfile)	57s
test (jruby-9.2, ubuntu-20.04, Gemfile)	1m 3s
test (jruby-9.3, ubuntu-20.04, Gemfile)	49s
test (jruby-9.4, ubuntu-20.04, Gemfile)	51s
test (truffleruby-22.1, ubuntu-20.04, Gemfile)	2m 37s
test (truffleruby-22.2, ubuntu-20.04, Gemfile)	4m 23s
test (truffleruby-22.3, ubuntu-20.04, Gemfile)	3m 34s
test (ubuntu-20.04, 2.7, gemfiles/public_suffix_2.rb)	35s
test (ubuntu-20.04, 2.7, gemfiles/public_suffix_3.rb)	48s
test (ubuntu-20.04, 2.7, gemfiles/public_suffix_4.rb)	47s
test (ubuntu-22.04, 3.1)	20s
test (macos-11, 3.1)	31s
test (macos-12, 3.1)	31s
test (windows-2019, 3.1)	56s
test (windows-2022, 3.1)	1m 31s
test (windows-2022, jruby-9.3)	2m 15s
test (ubuntu-20.04, head, Gemfile, true)	20s
test (ubuntu-20.04, jruby-head, Gemfile, true)	50s
test (ubuntu-20.04, truffleruby-head, Gemfile, true)	3m 55s
	38m 46s

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