Allow Rails 8 alpha #286

Job	Run time
Tests (2.7, rails_6.1, stable)	1m 43s
Tests (2.7, rails_7.0, stable)	1m 46s
Tests (2.7, rails_7.1, stable)	1m 57s
Tests (3.0, rails_6.1, stable)	17s
Tests (3.0, rails_7.0, stable)	12s
Tests (3.0, rails_7.1, stable)	16s
Tests (3.1, rails_6.1, stable)	11s
Tests (3.1, rails_7.0, stable)	12s
Tests (3.1, rails_7.1, stable)	16s
Tests (3.2, rails_7.0, stable)	17s
Tests (3.2, rails_7.1, stable)	10s
Tests (3.3, rails_7.0, stable)	15s
Tests (3.3, rails_7.1, stable)	16s
Tests (3.1, rails_edge, experimental)	31s
Tests (3.2, rails_edge, experimental)	12s
Tests (3.3, rails_edge, experimental)	21s
Tests (head, rails_7.0, experimental)	1m 27s
Tests (head, rails_7.1, experimental)	1m 31s
Tests (head, rails_edge, experimental)	1m 34s
Coverage	2s
	13m 26s

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