Bump turbo-rails from 2.0.17 to 2.0.20 #8443

Job	Run time
Test compatibility with Primer ViewComponents (main)	19m 18s
test (Rails 8.1, Ruby 3.4)	40s
test (Rails 8.0, Ruby 3.4)	27s
test (Rails main, Ruby head)	43s
benchmark	1m 36s
test (Rails 7.1, Ruby 3.2)	46s
test (Rails 7.2, Ruby 3.3)	46s
coverage	0s
	24m 16s

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