Add Rails 8 compatibility #187

Job	Run time
Tests (2.7, rails_6.1, stable)	47s
Tests (2.7, rails_7.0, stable)	39s
Tests (2.7, rails_7.1, stable)	49s
Tests (3.0, rails_6.1, stable)	21s
Tests (3.0, rails_7.0, stable)	22s
Tests (3.0, rails_7.1, stable)	28s
Tests (3.1, rails_6.1, stable)	28s
Tests (3.1, rails_7.0, stable)	28s
Tests (3.1, rails_7.1, stable)	30s
Tests (3.1, rails_7.2, stable)	29s
Tests (3.2, rails_7.0, stable)	24s
Tests (3.2, rails_7.1, stable)	28s
Tests (3.2, rails_7.2, stable)	31s
Tests (3.2, rails_8.0, stable)	29s
Tests (3.3, rails_7.0, stable)	27s
Tests (3.3, rails_7.1, stable)	31s
Tests (3.3, rails_7.2, stable)	27s
Tests (3.3, rails_8.0, stable)	28s
Tests (3.2, rails_edge, experimental)	29s
Tests (3.3, rails_edge, experimental)	30s
Tests (head, rails_7.1, experimental)	1m 29s
Tests (head, rails_7.2, experimental)	1m 32s
Tests (head, rails_8.0, experimental)	1m 22s
Tests (head, rails_edge, experimental)	1m 30s
Coverage	2s
	16m 0s

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