Development of 3.1.7 started. #397

Job	Run time
ruby-versions / Generate Ruby versions	3s
windows-latest 2.7	3m 14s
windows-latest 3.0	1m 41s
windows-latest 3.1	2m 10s
windows-latest 3.2	1m 22s
windows-latest 3.3	2m 40s
windows-latest 3.4	2m 8s
windows-latest jruby-head	2m 10s
windows-latest mingw	1m 44s
windows-latest mswin	2m 9s
	19m 21s

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