Add Rails 8.0 compatibility #337

Job	Run time
Ruby Tests (2.7, rails_6.1, stable)	27s
Ruby Tests (2.7, rails_7.0, stable)	27s
Ruby Tests (2.7, rails_7.1, stable)	28s
Ruby Tests (3.0, rails_6.1, stable)	17s
Ruby Tests (3.0, rails_7.0, stable)	17s
Ruby Tests (3.0, rails_7.1, stable)	12s
Ruby Tests (3.1, rails_6.1, stable)	13s
Ruby Tests (3.1, rails_7.0, stable)	11s
Ruby Tests (3.1, rails_7.1, stable)	24s
Ruby Tests (3.1, rails_7.2, stable)	12s
Ruby Tests (3.2, rails_7.0, stable)	15s
Ruby Tests (3.2, rails_7.1, stable)	13s
Ruby Tests (3.2, rails_7.2, stable)	22s
Ruby Tests (3.2, rails_8.0, stable)	16s
Ruby Tests (3.3, rails_7.0, stable)	15s
Ruby Tests (3.3, rails_7.1, stable)	19s
Ruby Tests (3.3, rails_7.2, stable)	13s
Ruby Tests (3.3, rails_8.0, stable)	14s
Ruby Tests (3.2, rails_edge, experimental)	15s
Ruby Tests (3.3, rails_edge, experimental)	19s
Ruby Tests (head, rails_7.1, experimental)	19s
Ruby Tests (head, rails_7.2, experimental)	14s
Ruby Tests (head, rails_8.0, experimental)	19s
Ruby Tests (head, rails_edge, experimental)	15s
Coverage	2s
	6m 58s

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