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Remove support for EOL Rails 7.1 #8435

Job	Run time
benchmark	2m 3s
test (Rails 8.0, Ruby 3.4)	1m 7s
test (Rails 7.2, Ruby 3.3)	1m 7s
test (Rails 8.1, Ruby 3.4)	41s
test (Rails 7.2, Ruby 3.2)	10s
Test compatibility with Primer ViewComponents (main)	17m 29s
test (Rails main, Ruby head)	58s
coverage	0s
	23m 35s