macos

Add 3.1.8 release note (#176) #577

Job	Run time
ruby-versions / Generate Ruby versions	4s
macos-13 3.1	24s
macos-13 3.0	24s
macos-13 2.7	1m 30s
macos-13 head	30s
macos-13 3.3	25s
macos-13 3.2	27s
macos-13 debug	37s
macos-13 3.4	23s
macos-14 2.7	38s
macos-14 3.0	18s
macos-13 jruby-head	1m 33s
macos-14 3.4	15s
macos-14 3.3	17s
macos-14 3.1	16s
macos-14 3.2	13s
macos-14 debug	22s
macos-14 jruby-head	38s
macos-14 head	18s
	9m 32s

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