chore(main): release google-cloud-memorystore-v1 1.8.0 (#33923) #105881

Job	Run time
CI (ubuntu-latest, 3.2, --test)	1m 10s
CI (macos-latest, 4.0, --test)	1m 8s
CI (ubuntu-latest, 4.0, --test)	58s
CI (windows-latest, 4.0, --test)	3m 13s
CI (ubuntu-latest, 3.4, --test)	1m 9s
CI (ubuntu-latest, 3.1, --test)	51s
CI (ubuntu-latest, 4.0, --rubocop-toplevel --rubocop --build --yard --linkinator)	1m 16s
CI (ubuntu-latest, 3.3, --test)	1m 16s
	11m 1s

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