Prepare release v3.1.0 #10

Job	Run time
pre-release-check / Check commit ancestor	5s
test / test (3.1, rails_7_0)	5m 38s
test / test (3.1, rails_7_1)	5m 43s
test / test (3.1, rails_7_2)	5m 56s
test / test (3.2, rails_7_0)	5m 34s
test / test (3.2, rails_7_1)	5m 30s
test / test (3.2, rails_7_2)	5m 47s
test / test (3.2, rails_8_0)	5m 44s
test / test (2.6, rails_5_2)	4m 50s
test / test (2.7, rails_6_0)	6m 7s
test / test (2.7, rails_6_1)	4m 44s
test / test (3.0, rails_7_0)	5m 28s
test / test (3.3, rails_7_2)	6m 29s
test / test (3.3, rails_8_0)	6m 21s
Publish Ruby Gem	5s
Create GitHub Release and Git tag	6s
	1h 14m 7s

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