build(deps): bump alpine from 3.20.3 to 3.21.2 #2178

Job	Run time
Check docs for incorrect links	9s
Run short go tests	22s
End-to-End test with kured with code and manifests from HEAD (TestE2EWithCommand, previous)	6m 16s
End-to-End test targetting a single version of kubernetes (TestCordonningIsKept/concurrency1)	3m 27s
End-to-End test with kured with code and manifests from HEAD (TestE2EWithCommand, current)	6m 43s
End-to-End test targetting a single version of kubernetes (TestCordonningIsKept/concurrency2)	3m 39s
End-to-End test with kured with code and manifests from HEAD (TestE2EWithCommand, next)	6m 18s
End-to-End test with kured with code and manifests from HEAD (TestE2EWithSignal, previous)	6m 19s
Build image and scan it against known vulnerabilities	1m 24s
End-to-End test with kured with code and manifests from HEAD (TestE2EWithSignal, current)	6m 10s
End-to-End test with kured with code and manifests from HEAD (TestE2EWithSignal, next)	6m 43s
End-to-End test with kured with code and manifests from HEAD (TestE2EConcurrentWithCommand, previ...	5m 17s
End-to-End test with kured with code and manifests from HEAD (TestE2EConcurrentWithCommand, current)	5m 50s
End-to-End test with kured with code and manifests from HEAD (TestE2EConcurrentWithCommand, next)	4m 51s
	1h 3m 28s

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