remove dependency to activerecord max 7.0 #441

Job	Run time
Rubocop	18s
legacy-activerecord-test (3.0, gemfiles/without_strong_migrations.gemfile)	57s
legacy-activerecord-test (3.0, gemfiles/activerecord61.gemfile)	59s
legacy-activerecord-test (3.0, gemfiles/activerecord60.gemfile)	58s
UnitTest (11.7, 2.7)	1m 10s
UnitTest (11.7, 3)	57s
legacy-activerecord-test (2.7, gemfiles/activerecord60.gemfile)	1m 14s
UnitTest (11.7, 3.1)	1m 0s
UnitTest (11.7, 3.2)	53s
UnitTest (12.14, 2.7)	1m 9s
UnitTest (12.14, 3)	56s
UnitTest (12.14, 3.1)	1m 0s
UnitTest (12.14, 3.2)	57s
UnitTest (15.2, 2.7)	1m 11s
UnitTest (15.2, 3)	1m 3s
UnitTest (15.2, 3.1)	1m 2s
UnitTest (15.2, 3.2)	1m 2s
	16m 46s

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