Add Rails 8 compatibility #188

Job	Run time
Tests (2.7, rails_6.1, stable)	24s
Tests (2.7, rails_7.0, stable)	29s
Tests (2.7, rails_7.1, stable)	23s
Tests (3.0, rails_6.1, stable)	13s
Tests (3.0, rails_7.0, stable)	10s
Tests (3.0, rails_7.1, stable)	11s
Tests (3.1, rails_6.1, stable)	16s
Tests (3.1, rails_7.0, stable)	11s
Tests (3.1, rails_7.1, stable)	15s
Tests (3.1, rails_7.2, stable)	16s
Tests (3.2, rails_7.0, stable)	14s
Tests (3.2, rails_7.1, stable)	13s
Tests (3.2, rails_7.2, stable)	12s
Tests (3.2, rails_8.0, stable)	16s
Tests (3.3, rails_7.0, stable)	16s
Tests (3.3, rails_7.1, stable)	13s
Tests (3.3, rails_7.2, stable)	17s
Tests (3.3, rails_8.0, stable)	24s
Tests (3.2, rails_edge, experimental)	13s
Tests (3.3, rails_edge, experimental)	16s
Tests (head, rails_7.1, experimental)	13s
Tests (head, rails_7.2, experimental)	13s
Tests (head, rails_8.0, experimental)	15s
Tests (head, rails_edge, experimental)	13s
Coverage	5s
	6m 21s

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