chore(main): release google-shopping-merchant-promotions-v1 0.4.0 (#3… #109188

Job	Run time
CI (macos-latest, 4.0, --test)	52s
CI (ubuntu-latest, 3.3, --test)	1m 4s
CI (windows-latest, 4.0, --test)	2m 49s
CI (ubuntu-latest, 4.0, --rubocop-toplevel --rubocop --build --yard)	1m 4s
CI (ubuntu-latest, 3.4, --test)	1m 5s
CI (ubuntu-latest, 4.0, --test)	57s
CI (ubuntu-latest, 3.2, --test)	1m 5s
	8m 56s

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