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Remove support for EOL Rails 7.1 #8436

Job	Run time
test (Rails main, Ruby head)	47s
test (Rails 7.2, Ruby 3.3)	39s
benchmark	1m 35s
test (Rails 8.1, Ruby 3.4)	29s
test (Rails 8.0, Ruby 3.4)	36s
Test compatibility with Primer ViewComponents (main)	3m 36s
coverage	-1s
	7m 41s