Bump alpine from 3.20 to 3.21 in /ops/services/container_instances/db… #2423

Job	Run time
build_docker	1m 46s
build_frontend	1m 33s
prerelease_backend	4m 17s
deploy	3m 9s
smoke_test_front_and_back_end	1m 9s
slack_alert	0s
failed_smoke_test_pagerduty_alert	0s
	11m 54s

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