Do not support old versions of Rails + Ruby / Prepare for 4.0.0 #289

Job	Run time
test (2.7, rails-7.0.gemfile)	48s
rubocop	23s
test (2.7, rails-7.1.gemfile)	48s
test-sample-app	41s
test (3.0, rails-7.0.gemfile)	21s
test (3.0, rails-7.1.gemfile)	29s
test (3.1, rails-7.0.gemfile)	26s
test (3.1, rails-7.1.gemfile)	31s
test (3.1, rails-main.gemfile)	45s
test (3.2, rails-7.0.gemfile)	27s
test (3.2, rails-7.1.gemfile)	30s
test (3.2, rails-main.gemfile)	28s
test (3.3, rails-7.0.gemfile)	24s
test (3.3, rails-7.1.gemfile)	26s
test (3.3, rails-main.gemfile)	29s
test (jruby-9.4, rails-7.0.gemfile)	6h 0m 13s
test (jruby-9.4, rails-7.1.gemfile)	6h 0m 14s
test (jruby-9.4, rails-main.gemfile)	6h 0m 13s
	18h 8m 36s

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