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Change to use Ruby 2.7 in `required_ruby_version` and `TargetRubyVersion` #158

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Run time

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Job	Run time
test (2.7)	23s
test (3.0)	10s
test (3.1)	11s
test (3.2)	13s
test (3.3)	12s
test (ruby-head)	10s
	1m 19s