Do not test Rails 7.0 against Ruby 3.4 dev #309

Job	Run time
Tests (2.7, rails_6.1, stable)	35s
Tests (2.7, rails_7.0, stable)	31s
Tests (2.7, rails_7.1, stable)	36s
Tests (3.0, rails_6.1, stable)	17s
Tests (3.0, rails_7.0, stable)	17s
Tests (3.0, rails_7.1, stable)	16s
Tests (3.1, rails_6.1, stable)	19s
Tests (3.1, rails_7.0, stable)	19s
Tests (3.1, rails_7.1, stable)	18s
Tests (3.1, rails_7.2, stable)	18s
Tests (3.2, rails_7.0, stable)	20s
Tests (3.2, rails_7.1, stable)	23s
Tests (3.2, rails_7.2, stable)	17s
Tests (3.3, rails_7.0, stable)	20s
Tests (3.3, rails_7.1, stable)	18s
Tests (3.3, rails_7.2, stable)	24s
Tests (3.1, rails_edge, experimental)	1m 30s
Tests (3.2, rails_edge, experimental)	19s
Tests (3.3, rails_edge, experimental)	19s
Tests (head, rails_7.1, experimental)	18s
Tests (head, rails_7.2, experimental)	1m 25s
Tests (head, rails_edge, experimental)	1m 25s
Coverage	5s
	11m 9s

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