build(deps): bump alpine from 3.20.3 to 3.21.0 #2143

Job	Run time
Run short go tests	23s
Check docs for incorrect links	10s
Build image and scan it against known vulnerabilities	1m 29s
End-to-End test with kured with code and manifests from HEAD (TestE2EWithCommand, previous)	6m 57s
End-to-End test targetting a single version of kubernetes (TestCordonningIsKept/concurrency1)	4m 42s
End-to-End test with kured with code and manifests from HEAD (TestE2EWithCommand, current)	7m 16s
End-to-End test with kured with code and manifests from HEAD (TestE2EWithCommand, next)	6m 13s
End-to-End test targetting a single version of kubernetes (TestCordonningIsKept/concurrency2)	5m 59s
End-to-End test with kured with code and manifests from HEAD (TestE2EWithSignal, previous)	6m 32s
End-to-End test with kured with code and manifests from HEAD (TestE2EWithSignal, current)	7m 38s
End-to-End test with kured with code and manifests from HEAD (TestE2EWithSignal, next)	6m 52s
End-to-End test with kured with code and manifests from HEAD (TestE2EConcurrentWithCommand, previ...	6m 21s
End-to-End test with kured with code and manifests from HEAD (TestE2EConcurrentWithCommand, current)	5m 58s
End-to-End test with kured with code and manifests from HEAD (TestE2EConcurrentWithCommand, next)	6m 4s
	1h 12m 34s

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