Update rubocop requirement from 1.66.1 to 1.68.0 (#139) #397

Job	Run time
Rubocop	16s
Test / Ruby 3.1	49s
Test / Ruby 3.2	45s
Test / Ruby 3.3	47s
Test / Ruby head	1m 51s
Test / E2E / Rails current / default frontend / minitest	2m 7s
Test / E2E / Rails current / default frontend / rspec	2m 8s
Test / E2E / Rails current / vite frontend / minitest	1m 16s
Test / E2E / Rails current / vite frontend / rspec	1m 12s
Test / E2E / Rails edge / default frontend / minitest	2m 15s
Test / E2E / Rails main / default frontend / minitest	2m 7s
Test / E2E / Rails main / default frontend / rspec	2m 3s
Test / E2E / Rails main / vite frontend / minitest	2m 3s
Test / E2E / Rails main / vite frontend / rspec	2m 10s
Test / All	1s
	21m 50s

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