Development of 3.1.5 started. #366

Job	Run time
ruby-versions / Generate Ruby versions	3s
windows-latest 2.7	2m 33s
windows-latest 3.0	1m 36s
windows-latest 3.1	1m 24s
windows-latest 3.2	1m 34s
windows-latest 3.3	1m 36s
windows-latest 3.4	2m 34s
windows-latest jruby-head	1m 37s
windows-latest mingw	1m 35s
windows-latest mswin	1m 37s
	16m 9s

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