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update CI and local dev for ruby 4 #8598

Job	Run time
Test compatibility with Primer ViewComponents (main)	20m 39s
benchmark	1m 58s
test (Rails 7.2, Ruby 3.3)	37s
test (Rails 8.0, Ruby 3.4)	32s
test (Rails 7.1, Ruby 3.2)	34s
test (Rails main, Ruby head)	28s
test (Rails 8.1, Ruby 4.0)	56s
coverage	0s
	25m 44s