Bump up v13.1.0 #355

Job	Run time
ruby-versions / Generate Ruby versions	2s
test (ubuntu-latest, 2.3)	57s
test (ubuntu-latest, 2.4)	58s
test (ubuntu-latest, 2.5)	56s
test (ubuntu-latest, 2.6)	50s
test (ubuntu-latest, 2.7)	59s
test (ubuntu-latest, 3.0)	17s
test (ubuntu-latest, 3.1)	19s
test (ubuntu-latest, 3.2)	20s
test (ubuntu-latest, head)	20s
test (ubuntu-latest, jruby)	6m 12s
test (ubuntu-latest, jruby-head)	5m 25s
test (macos-latest, 2.3)	2m 22s
test (macos-latest, 2.4)	1m 29s
test (macos-latest, 2.5)	1m 30s
test (macos-latest, 2.6)	2m 31s
test (macos-latest, 2.7)	1m 45s
test (macos-latest, 3.0)	28s
test (macos-latest, 3.1)	22s
test (macos-latest, 3.2)	36s
test (macos-latest, head)	25s
test (macos-latest, jruby)	5m 40s
test (macos-latest, jruby-head)	7m 52s
test (windows-latest, 2.3)	2m 53s
test (windows-latest, 2.4)	2m 22s
test (windows-latest, 2.5)	3m 8s
test (windows-latest, 2.6)	4m 57s
test (windows-latest, 2.7)	2m 59s
test (windows-latest, 3.0)	2m 2s
test (windows-latest, 3.1)	1m 40s
test (windows-latest, 3.2)	2m 45s
test (windows-latest, head)	1m 39s
	1h 7m 0s

Provide feedback