Add jruby-head to macos CI builds #483

Job	Run time
ruby-versions / Generate Ruby versions	5s
ubuntu-24.04 3.1	17s
ubuntu-24.04 3.2	19s
ubuntu-24.04 3.4	23s
ubuntu-24.04 3.3	21s
ubuntu-24.04 head	15s
ubuntu-24.04 debug	22s
ubuntu-24.04 truffleruby-head	24s
ubuntu-22.04 3.3	32s
ubuntu-22.04 3.0	16s
ubuntu-24.04 2.7	40s
ubuntu-22.04 3.2	26s
ubuntu-24.04 3.0	12s
ubuntu-22.04 3.1	15s
ubuntu-22.04 2.7	42s
ubuntu-22.04 jruby-head	1m 18s
ubuntu-24.04 jruby-head	1m 6s
ubuntu-22.04 head	15s
ubuntu-22.04 truffleruby-head	24s
ubuntu-22.04 debug	20s
ubuntu-22.04 3.4	16s
	9m 8s

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