chore: update to 1.15.1 #1834

Job	Run time
Lint golang code	8s
Run go tests	1m 3s
Lint bash code with shellcheck	4s
End-to-End test with kured with code and manifests from HEAD (command) (1.27)	15m 35s
End-to-End test with kured with code and manifests from HEAD (command) (1.28)	1h 3m 41s
End-to-End test with kured with code and manifests from HEAD (command) (1.29)	17m 32s
End-to-End test with kured with code and manifests from HEAD (concurrent) (1.27)	10m 13s
End-to-End test with kured with code and manifests from HEAD (concurrent) (1.28)	11m 36s
End-to-End test with kured with code and manifests from HEAD (concurrent) (1.29)	10m 38s
End-to-End test with kured with code and manifests from HEAD (signal) (1.27)	15m 42s
End-to-End test with kured with code and manifests from HEAD (signal) (1.28)	16m 22s
End-to-End test with kured with code and manifests from HEAD (signal) (1.29)	15m 34s
Build image and scan it against known vulnerabilities	1m 20s
Check docs for incorrect links	7s
	2h 59m 35s

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