Add jruby-head to macos CI builds #484

Job	Run time
ruby-versions / Generate Ruby versions	5s
ubuntu-24.04 3.4	17s
ubuntu-24.04 3.0	18s
ubuntu-24.04 3.2	19s
ubuntu-24.04 3.1	12s
ubuntu-24.04 3.3	20s
ubuntu-24.04 jruby-head	1m 11s
ubuntu-22.04 truffleruby-head	24s
ubuntu-22.04 debug	25s
ubuntu-24.04 head	17s
ubuntu-22.04 3.2	19s
ubuntu-22.04 3.3	20s
ubuntu-22.04 2.7	47s
ubuntu-24.04 debug	20s
ubuntu-22.04 3.1	18s
ubuntu-22.04 3.0	12s
ubuntu-24.04 2.7	46s
ubuntu-22.04 head	21s
ubuntu-24.04 truffleruby-head	23s
ubuntu-22.04 jruby-head	1m 24s
ubuntu-22.04 3.4	18s
	9m 16s

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