Remove support for Active Support < 5 #252

Job	Run time
Rubocop	10s
Ruby 3.0 / Gemfile	10s
Ruby 3.1 / Gemfile	7s
Ruby 3.2 / Gemfile	10s
Ruby 3.3 / Gemfile	8s
Ruby 3.0 / gemfiles/activesupport_6.1.gemfile	13s
Ruby 3.1 / gemfiles/activesupport_6.1.gemfile	8s
Ruby 3.2 / gemfiles/activesupport_6.1.gemfile	11s
Ruby 3.3 / gemfiles/activesupport_6.1.gemfile	12s
Ruby 3.0 / gemfiles/activesupport_7.0.gemfile	8s
Ruby 3.1 / gemfiles/activesupport_7.0.gemfile	12s
Ruby 3.2 / gemfiles/activesupport_7.0.gemfile	12s
Ruby 3.3 / gemfiles/activesupport_7.0.gemfile	8s
Ruby 3.0 / gemfiles/activesupport_7.1.gemfile	9s
Ruby 3.1 / gemfiles/activesupport_7.1.gemfile	13s
Ruby 3.2 / gemfiles/activesupport_7.1.gemfile	10s
Ruby 3.3 / gemfiles/activesupport_7.1.gemfile	10s
Ruby 3.1 / gemfiles/activesupport_edge.gemfile	46s
Ruby 3.2 / gemfiles/activesupport_edge.gemfile	17s
Ruby 3.3 / gemfiles/activesupport_edge.gemfile	19s
	4m 13s

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