[release-21.0] Release of `v21.0.3` (#17756) #651

Job	Run time
Build and push vttestserver (mysql80)	2m 31s
Build and push lite (latest)	4m 29s
Build and push lite (percona80)	4m 40s
Build and push (bullseye, vtadmin)	1m 40s
Build and push (bullseye, vtorc)	54s
Build and push (bullseye, vtgate)	1m 6s
Build and push (bullseye, vttablet)	56s
Build and push (bullseye, mysqlctld)	44s
Build and push (bullseye, mysqlctl)	52s
Build and push (bullseye, vtctl)	50s
Build and push (bullseye, vtctlclient)	1m 6s
Build and push (bullseye, vtctld)	1m 55s
Build and push (bullseye, vtctldclient)	47s
Build and push (bullseye, logrotate)	33s
Build and push (bullseye, logtail)	36s
Build and push (bullseye, vtbackup)	48s
Build and push (bullseye, vtexplain)	1m 7s
Build and push (bookworm, vtadmin)	1m 50s
Build and push (bookworm, vtorc)	47s
Build and push (bookworm, vtgate)	1m 2s
Build and push (bookworm, vttablet)	1m 24s
Build and push (bookworm, mysqlctld)	1m 21s
Build and push (bookworm, mysqlctl)	52s
Build and push (bookworm, vtctl)	1m 13s
Build and push (bookworm, vtctlclient)	55s
Build and push (bookworm, vtctld)	1m 56s
Build and push (bookworm, vtctldclient)	1m 1s
Build and push (bookworm, logrotate)	46s
Build and push (bookworm, logtail)	47s
Build and push (bookworm, vtbackup)	1m 22s
Build and push (bookworm, vtexplain)	1m 1s
Slack Notification if failed	0s
	41m 51s

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