Remove incompatible combinations of Ruby/ActiveRecord versions from CI #240

Job	Run time
Test against Ruby 3.0 / ActiveModel 6.1	19s
Test against Ruby 3.0 / ActiveModel 7.0	21s
Test against Ruby 3.0 / ActiveModel 7.1	1m 19s
Test against Ruby 3.1 / ActiveModel 6.1	23s
Test against Ruby 3.1 / ActiveModel 7.0	23s
Test against Ruby 3.1 / ActiveModel 7.1	18s
Test against Ruby 3.1 / ActiveModel 7.2	19s
Test against Ruby 3.2 / ActiveModel 6.1	19s
Test against Ruby 3.2 / ActiveModel 7.0	19s
Test against Ruby 3.2 / ActiveModel 7.1	20s
Test against Ruby 3.2 / ActiveModel 7.2	21s
Test against Ruby 3.2 / ActiveModel 8.0	21s
Test against Ruby 3.3 / ActiveModel 6.1	22s
Test against Ruby 3.3 / ActiveModel 7.0	20s
Test against Ruby 3.3 / ActiveModel 7.1	18s
Test against Ruby 3.3 / ActiveModel 7.2	20s
Test against Ruby 3.3 / ActiveModel 8.0	21s
Test against Ruby 3.4.0-preview1 / ActiveModel 7.1	1m 18s
Test against Ruby 3.4.0-preview1 / ActiveModel 7.2	1m 20s
Test against Ruby 3.4.0-preview1 / ActiveModel 8.0	1m 18s
	10m 39s

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