Add jruby-head to macos CI builds #424

Job	Run time
ruby-versions / Generate Ruby versions	4s
windows-latest 2.7	1m 29s
windows-latest 3.0	52s
windows-latest mingw	41s
windows-latest 3.1	1m 2s
windows-latest 3.4	42s
windows-latest jruby-head	1m 19s
windows-latest 3.3	44s
windows-latest 3.2	3m 4s
windows-latest mswin	48s
	10m 45s

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