chore(main): release google-cloud-security_center 2.2.0 (#34425) #108291

Job	Run time
CI (windows-latest, 4.0, --test)	2m 42s
CI (ubuntu-latest, 3.4, --test)	1m 3s
CI (ubuntu-latest, 4.0, --rubocop-toplevel --rubocop --build --yard)	1m 4s
CI (ubuntu-latest, 3.3, --test)	58s
CI (ubuntu-latest, 4.0, --test)	49s
CI (macos-latest, 4.0, --test)	43s
CI (ubuntu-latest, 3.2, --test)	59s
	8m 18s

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