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Bump haml from 6.3.0 to 7.0.2 #8478

Job	Run time
benchmark	1m 30s
Test compatibility with Primer ViewComponents (main)	1m 50s
test (Rails 8.0, Ruby 3.4)	43s
test (Rails main, Ruby head)	46s
test (Rails 8.1, Ruby 3.4)	34s
test (Rails 7.1, Ruby 3.2)	40s
test (Rails 7.2, Ruby 3.3)	37s
coverage	0s
	6m 40s