Test against Ruby 3.3 #161

Job	Run time
Tests (2.7, rails_6.1, stable)	27s
Tests (2.7, rails_7.0, stable)	27s
Tests (2.7, rails_7.1, stable)	23s
Tests (3.0, rails_6.1, stable)	17s
Tests (3.0, rails_7.0, stable)	11s
Tests (3.0, rails_7.1, stable)	17s
Tests (3.1, rails_6.1, stable)	16s
Tests (3.1, rails_7.0, stable)	15s
Tests (3.1, rails_7.1, stable)	19s
Tests (3.2, rails_7.0, stable)	12s
Tests (3.2, rails_7.1, stable)	15s
Tests (3.3, rails_7.0, stable)	1m 30s
Tests (3.3, rails_7.1, stable)	1m 15s
Tests (2.7, rails_edge, experimental)	35s
Tests (3.0, rails_edge, experimental)	1m 11s
Tests (3.1, rails_edge, experimental)	1m 27s
Tests (3.2, rails_edge, experimental)	17s
Tests (head, rails_7.0, experimental)	1m 26s
Tests (head, rails_7.1, experimental)	1m 22s
Tests (head, rails_edge, experimental)	1m 26s
Coverage	3s
	13m 51s

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