build(deps): bump alpine from 3.20.3 to 3.21.2 #2165

Job	Run time
Build image and scan it against known vulnerabilities	48s
Run short go tests	1m 25s
End-to-End test targetting a single version of kubernetes (TestCordonningIsKept/concurrency1)	5m 18s
End-to-End test targetting a single version of kubernetes (TestCordonningIsKept/concurrency2)	4m 27s
Check docs for incorrect links	12s
End-to-End test with kured with code and manifests from HEAD (TestE2EWithCommand, previous)	5m 36s
End-to-End test with kured with code and manifests from HEAD (TestE2EWithCommand, current)	5m 53s
End-to-End test with kured with code and manifests from HEAD (TestE2EWithCommand, next)	6m 46s
End-to-End test with kured with code and manifests from HEAD (TestE2EWithSignal, previous)	5m 51s
End-to-End test with kured with code and manifests from HEAD (TestE2EWithSignal, current)	5m 44s
End-to-End test with kured with code and manifests from HEAD (TestE2EWithSignal, next)	6m 9s
End-to-End test with kured with code and manifests from HEAD (TestE2EConcurrentWithCommand, previ...	5m 16s
End-to-End test with kured with code and manifests from HEAD (TestE2EConcurrentWithCommand, current)	5m 49s
End-to-End test with kured with code and manifests from HEAD (TestE2EConcurrentWithCommand, next)	5m 39s
	1h 4m 53s

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