Bump up 3.1.7 #346

Job	Run time
ruby-versions / Generate Ruby versions	3s
ubuntu-latest 2.7	49s
ubuntu-latest 3.0	25s
ubuntu-latest 3.1	26s
ubuntu-latest 3.2	28s
ubuntu-latest 3.3	28s
ubuntu-latest debug	41s
ubuntu-latest head	26s
macos-latest 2.7	1m 38s
macos-latest 3.0	34s
macos-latest 3.1	35s
macos-latest 3.2	38s
macos-latest 3.3	34s
macos-latest debug	1m 1s
macos-latest head	38s
macos-arm-oss 2.7	52s
macos-arm-oss 3.0	24s
macos-arm-oss 3.1	30s
macos-arm-oss 3.2	24s
macos-arm-oss 3.3	23s
macos-arm-oss debug	27s
macos-arm-oss head	20s
windows-latest 2.7	4m 25s
windows-latest 3.0	2m 53s
windows-latest 3.1	2m 47s
windows-latest 3.2	3m 17s
windows-latest 3.3	3m 25s
windows-latest head	2m 8s
windows-latest mingw	1m 57s
windows-latest mswin	1m 35s
	35m 11s

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