chore(main): release google-cloud-memcache-v1 2.5.0 #106028

Job	Run time
CI (ubuntu-latest, 3.1, --test)	47s
CI (ubuntu-latest, 4.0, --test)	52s
CI (windows-latest, 4.0, --test)	3m 20s
CI (ubuntu-latest, 3.4, --test)	1m 10s
CI (ubuntu-latest, 4.0, --rubocop-toplevel --rubocop --build --yard --linkinator)	1m 15s
CI (ubuntu-latest, 3.2, --test)	1m 10s
CI (ubuntu-latest, 3.3, --test)	1m 6s
CI (macos-latest, 4.0, --test)	1m 0s
	10m 40s

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