macos-12 is deprecated now. We should update it to macos-14 #1190

Job	Run time
ruby-versions / Generate Ruby versions	7s
ubuntu-22.04 2.7	42s
ubuntu-22.04 3.0	20s
ubuntu-22.04 3.1	30s
ubuntu-22.04 3.2	18s
ubuntu-22.04 3.3	20s
ubuntu-22.04 head	22s
ubuntu-20.04 2.7	39s
ubuntu-20.04 3.0	21s
ubuntu-20.04 3.1	20s
ubuntu-20.04 3.2	19s
ubuntu-20.04 3.3	22s
ubuntu-20.04 head	19s
macos-14 2.7	51s
macos-14 3.0	19s
macos-14 3.1	22s
macos-14 3.2	22s
macos-14 3.3	33s
macos-14 head	19s
macos-13 2.7	2m 1s
macos-13 3.0	44s
macos-13 3.1	29s
macos-13 3.2	32s
macos-13 3.3	29s
macos-13 head	35s
windows-latest 2.7	3m 2s
windows-latest 3.0	2m 1s
windows-latest 3.1	2m 9s
windows-latest 3.2	2m 30s
windows-latest 3.3	3m 56s
windows-latest ucrt	2m 15s
windows-latest mswin	1m 45s
ubuntu-20.04 jruby	1m 31s
ubuntu-20.04 jruby-head	1m 20s
	33m 4s

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