v2.x - Support Ruby 3.4 #404

Job	Run time
rubocop	14s
Unit test (ubuntu-20.04, 3)	1m 51s
Unit test (ubuntu-20.04, 3.1)	1m 44s
Unit test (ubuntu-20.04, 3.2)	1m 54s
Unit test (ubuntu-20.04, 3.3)	1m 43s
Unit test (ubuntu-20.04, 3.4)	1m 41s
Unit test (ubuntu-20.04, jruby-9.4)	2m 35s
Unit test (ubuntu-20.04, truffleruby)	3m 50s
Unit test (macos-latest, 3)	1m 44s
Unit test (macos-latest, 3.1)	1m 40s
Unit test (macos-latest, 3.2)	1m 29s
Unit test (macos-latest, 3.3)	1m 47s
Unit test (macos-latest, 3.4)	1m 53s
Unit test (macos-latest, jruby-9.4)	2m 5s
Unit test (macos-latest, truffleruby)	2m 53s
Unit test (windows-latest, 3)	3m 27s
Unit test (windows-latest, 3.1)	2m 46s
Unit test (windows-latest, 3.2)	2m 57s
Unit test (windows-latest, 3.3)	3m 51s
Unit test (windows-latest, 3.4)	4m 16s
finish	3s
	46m 23s

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