Fix condition in 3.1.3 entry #345

Job	Run time
ruby-versions / Generate Ruby versions	3s
windows-latest 2.7	1m 43s
windows-latest 3.0	1m 34s
windows-latest 3.1	1m 34s
windows-latest 3.2	1m 48s
windows-latest 3.3	1m 49s
windows-latest 3.4	1m 53s
windows-latest mingw	1m 21s
windows-latest mswin	1m 4s
	12m 49s

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