chore(main): release owlbot-postprocessor 0.9.12 #878

Job	Run time
CI (ubuntu-latest, 3.3, false, --only --rubocop)	15s
CI (ubuntu-latest, 3.1, true, --only --test)	10m 3s
CI (ubuntu-latest, 3.3, true, --only --test)	9m 51s
CI (ubuntu-latest, 3.4, true, --only --test)	9m 26s
	29m 35s

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