Add Rails 7.1 compatibility #230

Job	Run time
Tests (2.7, rails_6.1, stable)	49s
Tests (2.7, rails_7.0, stable)	50s
Tests (2.7, rails_7.1, stable)	1m 7s
Tests (3.0, rails_6.1, stable)	36s
Tests (3.0, rails_7.0, stable)	40s
Tests (3.0, rails_7.1, stable)	1m 0s
Tests (3.1, rails_6.1, stable)	38s
Tests (3.1, rails_7.0, stable)	50s
Tests (3.1, rails_7.1, stable)	47s
Tests (3.2, rails_7.0, stable)	36s
Tests (3.2, rails_7.1, stable)	37s
Tests (2.7, rails_edge, experimental)	53s
Tests (3.0, rails_edge, experimental)	46s
Tests (3.1, rails_edge, experimental)	48s
Tests (3.2, rails_edge, experimental)	48s
Tests (head, rails_6.1, experimental)	2m 5s
Tests (head, rails_7.0, experimental)	2m 29s
Tests (head, rails_7.1, experimental)	2m 2s
Tests (head, rails_edge, experimental)	2m 0s
Coverage	4s
	20m 25s

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