Replaced macos-15-intel from macos-13 and added macos-15 #625

Job	Run time
ruby-versions / Generate Ruby versions	5s
ubuntu-24.04 2.7	43s
ubuntu-24.04 3.0	12s
ubuntu-24.04 debug	26s
ubuntu-22.04 2.7	42s
ubuntu-24.04 3.1	16s
ubuntu-24.04 head	14s
ubuntu-24.04 3.4	15s
ubuntu-24.04 jruby-head	1m 13s
ubuntu-24.04 3.3	19s
ubuntu-24.04 3.2	16s
ubuntu-24.04 truffleruby-head	37s
ubuntu-22.04 3.1	20s
ubuntu-22.04 debug	34s
ubuntu-22.04 truffleruby-head	31s
ubuntu-22.04 head	15s
ubuntu-22.04 3.4	22s
ubuntu-22.04 3.2	21s
ubuntu-22.04 3.3	15s
ubuntu-22.04 jruby-head	1m 14s
ubuntu-22.04 3.0	15s
	9m 25s

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