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Dispatch push_gem against the tag ref, not main #9067

Job	Run time
Test compatibility with Primer ViewComponents (main)	1m 33s
test (Rails main, Ruby 4.0)	54s
test (Rails 7.2, Ruby 3.3)	39s
test (Rails main_head, Ruby head)	30s
benchmark	1m 34s
test (Rails 8.0, Ruby 3.4)	41s
test (Rails 7.1, Ruby 3.2)	46s
test (Rails 8.1, Ruby 4.0)	35s
coverage	17s
	7m 29s