Replaced macos-15-intel from macos-13 and added macos-15 (#198) #626

Job	Run time
ruby-versions / Generate Ruby versions	3s
ubuntu-24.04 3.2	20s
ubuntu-24.04 2.7	46s
ubuntu-24.04 3.0	20s
ubuntu-24.04 head	15s
ubuntu-24.04 3.1	17s
ubuntu-24.04 3.3	21s
ubuntu-24.04 3.4	18s
ubuntu-24.04 debug	27s
ubuntu-22.04 2.7	44s
ubuntu-24.04 truffleruby-head	32s
ubuntu-22.04 3.0	19s
ubuntu-24.04 jruby-head	1m 12s
ubuntu-22.04 3.2	19s
ubuntu-22.04 3.3	25s
ubuntu-22.04 head	17s
ubuntu-22.04 3.1	13s
ubuntu-22.04 debug	26s
ubuntu-22.04 3.4	21s
ubuntu-22.04 truffleruby-head	43s
ubuntu-22.04 jruby-head	1m 15s
	9m 53s

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