Add 3.1.4 entry #365

Job	Run time
ruby-versions / Generate Ruby versions	3s
windows-latest 2.7	2m 11s
windows-latest 3.0	1m 19s
windows-latest 3.1	1m 17s
windows-latest 3.2	1m 20s
windows-latest 3.3	1m 29s
windows-latest 3.4	2m 10s
windows-latest jruby-head	1m 41s
windows-latest mingw	1m 20s
windows-latest mswin	1m 36s
	14m 26s

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