Add Ruby 3.4 to CI matrix #419

Job	Run time
Rubocop	29s
Test / Ruby 3.2	51s
Test / Ruby 3.3	50s
Test / Ruby 3.4	59s
Test / Ruby head	3m 46s
Test / E2E / Rails current / default frontend / minitest	1m 59s
Test / E2E / Rails current / default frontend / rspec	2m 8s
Test / E2E / Rails current / vite frontend / minitest	2m 6s
Test / E2E / Rails current / vite frontend / rspec	1m 59s
Test / E2E / Rails edge / default frontend / minitest	2m 6s
Test / E2E / Rails main / default frontend / minitest	2m 3s
Test / E2E / Rails main / default frontend / rspec	2m 9s
Test / E2E / Rails main / vite frontend / minitest	2m 0s
Test / E2E / Rails main / vite frontend / rspec	2m 1s
Test / All	1s
	25m 27s

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