chore(main): release google-shopping-merchant-reports 0.6.0 (#34569) #109190

Job	Run time
CI (ubuntu-latest, 3.2, --test)	57s
CI (windows-latest, 4.0, --test)	3m 5s
CI (ubuntu-latest, 3.4, --test)	1m 2s
CI (ubuntu-latest, 3.3, --test)	1m 15s
CI (macos-latest, 4.0, --test)	57s
CI (ubuntu-latest, 4.0, --test)	49s
CI (ubuntu-latest, 4.0, --rubocop-toplevel --rubocop --build --yard)	56s
	9m 1s

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