Add ActiveRecord versions 7.2 and 8.0 to CI matrix #239

Job	Run time
Test against Ruby 3.0 / ActiveModel 6.1	18s
Test against Ruby 3.0 / ActiveModel 7.0	18s
Test against Ruby 3.0 / ActiveModel 7.1	1m 20s
Test against Ruby 3.0 / ActiveModel 7.2	6s
Test against Ruby 3.0 / ActiveModel 8.0	5s
Test against Ruby 3.1 / ActiveModel 6.1	21s
Test against Ruby 3.1 / ActiveModel 7.0	23s
Test against Ruby 3.1 / ActiveModel 7.1	20s
Test against Ruby 3.1 / ActiveModel 7.2	19s
Test against Ruby 3.1 / ActiveModel 8.0	5s
Test against Ruby 3.2 / ActiveModel 6.1	20s
Test against Ruby 3.2 / ActiveModel 7.0	23s
Test against Ruby 3.2 / ActiveModel 7.1	20s
Test against Ruby 3.2 / ActiveModel 7.2	19s
Test against Ruby 3.2 / ActiveModel 8.0	19s
Test against Ruby 3.3 / ActiveModel 6.1	18s
Test against Ruby 3.3 / ActiveModel 7.0	18s
Test against Ruby 3.3 / ActiveModel 7.1	17s
Test against Ruby 3.3 / ActiveModel 7.2	18s
Test against Ruby 3.3 / ActiveModel 8.0	17s
Test against Ruby 3.4.0-preview1 / ActiveModel 7.1	1m 23s
Test against Ruby 3.4.0-preview1 / ActiveModel 7.2	1m 26s
Test against Ruby 3.4.0-preview1 / ActiveModel 8.0	1m 19s
	10m 52s

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