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Bump better_html from 2.1.1 to 2.2.0 #8420

Job	Run time
benchmark	1m 34s
test (Rails 8.1, Ruby 3.4)	36s
test (Rails 7.1, Ruby 3.2)	43s
test (Rails 7.2, Ruby 3.3)	38s
Test compatibility with Primer ViewComponents (main)	2m 6s
test (Rails 8.0, Ruby 3.4)	29s
test (Rails main, Ruby head)	40s
coverage	-1s
	6m 45s